Segment Reporting [Abstract] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Corporate Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Net Lease Net Lease Segment [Member] Net Lease Segment [Member] Self Storage Self Storage [Member] Self Storage Multi-family Multifamily [Member] All Other Other Segments [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Segment Reporting Information, Additional Information Segment Reporting Information, Additional Information [Abstract] Long-Lived Assets Long-Lived Assets Assets Assets Real Estate [Abstract] Net Investments in Properties, Real Estate Under Construction, and Equity Investment in Real Estate Real Estate Disclosure [Text Block] Earnings Per Share [Abstract] Basic and Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Receivables [Abstract] Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivatives in Cash Flow Hedging Relationships Cash Flow Hedging [Member] Net Investment Hedging Net Investment Hedging [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign currency forward contracts Foreign Exchange Contract [Member] Interest rate swaps Interest Rate Swap [Member] Foreign currency collars Foreign Currency Collars [Member] Foreign Currency Collars [Member] Interest rate caps Interest Rate Cap [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract] Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Effective Portion) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Financing Receivables Financing Receivables [Text Block] Income Statement [Abstract] Distributions of available cash Distributions of Available Cash Amount of cash generated from operations, excluding capital proceeds, as reduced by operating expenses and debt service, excluding prepayments and lump-sum or "balloon" payments, that is available to distribute to the advisor. Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Reconciliation of Assets from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Intangible Assets And Liabilities [Abstract] Intangible Assets And Liabilities [Abstract] Schedule Of Acquired Finite Lived Intangible Asset Liability By Major Class [Table] Schedule Of Acquired Finite Lived Intangible Asset Liability By Major Class [Table] -- None. No documentation exists for this element. -- Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] In-place lease Leases, Acquired-in-Place [Member] Below-market ground lease Below Market Ground Lease [Member] Intangible asset related to an area of land subject to a ground lease. Above-market rent Above Market Leases [Member] Finite-Lived Intangible Liabilities By Major Class [Axis] [Axis] Finite-Lived Intangible Liabilities By Major Class [Axis] [Axis] -- None. No documentation exists for this element. -- Finite-Lived Intangible Liabilities, Major Class Name [Domain] Finite-Lived Intangible Liabilities, Major Class Name [Domain] -- None. No documentation exists for this element. -- Below-market rent Below Market Rent [Member] Below Market Rent [Member] Above-market ground lease Above Market Ground Lease [Member] Intangible liability related to an area of land subject to a ground lease. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Finite Lived Intangible Assets Liabilities [Line Items] Intangible Assets Liabilities [Line Items] Intangible Assets Liabilities [Line Items] Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Amortizable Intangible Assets Finite-Lived Intangible Assets, Net [Abstract] Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-lived intangible assets, net Finite-Lived Intangible Assets, Net Goodwill Goodwill Total intangible assets, gross Intangible Assets, Gross (Including Goodwill) Intangible Assets, Gross (Including Goodwill) Total intangible assets, net Intangible Assets, Net (Including Goodwill) Amortizable Intangible Liability Finite Lived Intangible Liabilities Net [Abstract] Finite Lived Intangible Liabilities Net Finite-Lived Intangible Liabilities, Gross Finite-Lived Intangible Liabilities, Gross Amount before amortization of liabilities, excluding financial liabilities, lacking physical substance with a finite life. Finite Lived Intangible Liabilities Accumulated Amortization Finite Lived Intangible Liabilities Accumulated Amortization Accumulated amount of amortization of liabilities, excluding financial liabilities, lacking physical substance with a finite life. Finite Lived Intangible Liabilities Net Finite Lived Intangible Liabilities Net Amount after amortization of liabilities, excluding financial liabilities and goodwill, lacking physical substance with a finite life. Related Party Transactions [Abstract] Agreements and Transactions with Related Parties Related Party Transactions Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Mortgage Loans On Real Estate Interest Rate [Axis] Mortgage Loans On Real Estate Interest Rate [Axis] Mortgage Loans On Real Estate Interest Rate Mortgage Loans On Real Estate Interest Rate [Domain] Mortgage Loans On Real Estate Interest Rate [Domain] Mortgage Loans On Real Estate Interest Rate Fixed Interest Rate Fixed Interest Rate [Member] Fixed Interest Rate Variable Interest Rate Variable Interest Rate [Member] Variable Interest Rate Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Debt Refinanced Debt Refinanced [Member] Debt Refinanced [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Office Building in Eindhoven, the Netherlands Office Building in Eindhoven, the Netherlands [Member] Office Building in Eindhoven, the Netherlands [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] EURIBOR EURIBOR [Member] EURIBOR [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term debt Long-term Debt [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instruments Debt Instruments [Abstract] Mortgage loan on real estate, interest rate Mortgage Loans on Real Estate, Interest Rate Debt instrument, maturity date range, start Debt Instrument, Maturity Date Range, Start Debt instrument, maturity date range, end Debt Instrument, Maturity Date Range, End Mortgage loan Mortgage Loans on Real Estate Mortgage loan term Debt Instrument, Term Variable interest rate on debt Debt Instrument, Basis Spread on Variable Rate Liquidity spread Liquidity Spread Liquidity spread to be applied to the margin rate in order to determine interest rate when EURIBOR is below zero. Effect of exchange rate fluctuation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Real Estate Under Construction Real Estate Under Construction [Abstract] Real Estate Under Construction Beginning balance Construction in Progress, Gross Capitalized funds Funds Capitalized For Construction In Progress Construction costs capitalized to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. Foreign currency translation adjustments Foreign Currency Translation And Other Impacts on Real Estate Under Construction Other impacts on the carrying value of real estate under construction that includes but is not limited to foreign currency translation adjustments and building improvements. Placed into service Construction In Progress Placed Into Service Amount of assets under construction that are now placed into service as the balance sheet date. Capitalized interest Interest Costs Capitalized Ending balance Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments Operating Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Straight line rent adjustment Straight Line Rent Adjustments Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Reclassification Scenario, Adjustment [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Cipriani Cipriani [Member] Cipriani [Member] Property Leased to Mills Fleet Farm Group LLC Property Leased to Mills Fleet Farm Group LLC [Member] Property Leased to Mills Fleet Farm Group LLC [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Interest income from direct financing leases Capital Leases, Income Statement, Direct Financing Lease Revenue Notes receivable Accounts and Notes Receivable, Net Number of properties Number of Real Estate Properties Real estate under construction Net investments in direct financing leases Capital Leases, Net Investment in Direct Financing Leases Organization and Offering Organization [Abstract] Organization [Abstract] Organization And Offering [Table] Organization And Offering [Table] -- None. No documentation exists for this element. -- Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Operating Real Estate Operating Real Estate [Member] Assets or investments located within Operating real estate on the consolidated balance sheet. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A common stock Common Class A [Member] Class C common stock Common Class C [Member] Organization and Offering [Line Items] Organization and Offering [Line Items] Organization and Offering [Line Items] Public Offering Offering [Abstract] Offering [Abstract] Capital interest ownership in operating partnership Capital Interest In Operating Partnership The percentage of capital interest in the Operating Partnership by the general partner. Additional Disclosures Other Business Disclosures [Abstract] Other Business Disclosures Number of tenants Number of tenants The number of tenants occupying the real estate properties owned as of the balance sheet date. Area of real estate property Area of Real Estate Property Proceeds from issuance of shares, net of issuance costs Proceeds from Issuance Initial Public Offering Proceeds from dividend reinvestment plan Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statement Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Class A Class C Statement [Line Items] Statement [Line Items] Statements of Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Distributions declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Total CPA 18 - Global Stockholders Parent [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Distributions and Accumulated Losses Accumulated Distributions in Excess of Net Income [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Noncontrolling Interests Noncontrolling Interest [Member] Beginning equity balance, value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Beginning equity balance, shares Common Stock, Shares, Outstanding Shares issued net of offering cost, value Stock Issued During Period, Value, New Issues Shares issued net of offering cost, shares Stock Issued During Period, Shares, New Issues Shares issued to affiliate, value Stock Issued During Period, Value, Other Shares issued to affiliate, shares Stock Issued During Period, Shares, Other Stock-based compensation, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Contributions from noncontrolling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions declared Dividends Net Income (Loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Change in net unrealized loss on derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Repurchase of shares, value Stock Repurchased During Period, Value Repurchase of shares, shares Stock Repurchased During Period, Shares Ending equity balance, value Ending equity balance, shares Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Non recourse debt Non Recourse Debt [Member] Non Recourse Debt [Member] Bonds payable Bonds [Member] Fair Value Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Rent guarantees, fair value Other Assets, Fair Value Disclosure Discount rate on rent guarantee Fair Value Inputs, Discount Rate Growth rate Growth Rate The anticipated growth rate used in calculating estimating the fair value of an unobservable asset. Assets fair value adjustment Assets, Fair Value Adjustment Deferred financing costs Debt Issuance Costs, Net Net Income (Loss) Per Share and Equity Stockholders' Equity Note Disclosure [Text Block] Self Storage Segment Reporting Information, Profit (Loss) Segment Reporting Information, Profit (Loss) [Abstract] Revenues Revenues Operating expenses Operating Expenses Interest expense Interest Expense Other income and expenses, excluding interest expense Other Income and Expenses Excluding Interest Expense The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations, excluding interest expense. Provision for income taxes Income Tax Expense (Benefit) Loss on sale of real estate, net of tax Gains (Losses) on Sales of Investment Real Estate Unallocated Corporate Overhead Selling, General and Administrative Expense Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to CPA®:18 – Global Net Income (Loss) Attributable to Parent Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Real Estate [Member] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Investments in real estate: Real Estate Investment Property, Net [Abstract] Land Land Buildings and improvements Investment Building and Building Improvements Less: Accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Net investments in properties Real Estate Investment Property, Net Intangible Assets and Liabilities Intangible Assets And Liabilities Disclosure [Text Block] The entire disclosure for all or part of the information related to intangible assets and liabilities. Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Internally Assigned Grade 1 Internally Assigned Grade1 [Member] Internally Assigned Grade1 [Member] Internally Assigned Grade 2 Internally Assigned Grade2 [Member] Internally Assigned Grade2 [Member] Internally Assigned Grade 3 Internally Assigned Grade3 [Member] Internally Assigned Grade3 [Member] Internally Assigned Grade 4 Internally Assigned Grade4 [Member] Internally Assigned Grade4 [Member] Internally Assigned Grade 5 Internally Assigned Grade5 [Member] Internally Assigned Grade5 [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Credit Quality Of Finance Receivables Credit Quality Of Finance Receivables [Abstract] Credit Quality Of Finance Receivables Number of tenants and obligors Number of Tenants and Obligors The number of tenants occupying the real estate properties owned and the number of obligors to us as of the balance sheet date. Carrying Value Financing Receivable, Net Document and Entity Information [Abstract] Document And Entity Information. Document Information [Table] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Central Index Key Entity Central Index Key Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] VIE Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity Variable Interest Entity [Line Items] Assets Assets [Abstract] Net investments in properties Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value In-place lease intangible assets, net Finite-Lived Intangible Asset, Acquired-in-Place Leases, Net This element represents the amount of value that was allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property, net of accumulated amortization at the balance sheet date. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. Other intangible assets, net Other Intangible Assets, Net Other assets, net Other Assets Total assets Liabilities Liabilities [Abstract] Non-recourse debt, net Secured Debt Bonds payable, net Notes Payable Deferred income taxes Deferred Tax Liabilities, Net Accounts payable, accrued expenses and other liabilities Accounts Payable and Accrued Liabilities Total liabilities Liabilities Non-Recourse Debt and Bonds Payable Debt Disclosure [Text Block] Statement of Financial Position [Abstract] Real estate, at cost Rental Properties Operating real estate, at cost Real Estate Investments, Other Accumulated depreciation Net investments in real estate Real Estate Investments, Net Equity investment in real estate Equity Method Investments Liabilities and Equity Liabilities and Equity [Abstract] Liabilities: Due to affiliate Due to Related Parties Distributions payable Dividends Payable Commitments and contingencies (Note 10) Commitments and Contingencies Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] CPA®:18 – Global stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value; 50,000,000 shares authorized; none issued Preferred Stock, Value, Issued Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Distributions and accumulated losses Accumulated Distributions in Excess of Net Income Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total CPA®:18 – Global stockholders’ equity Stockholders' Equity Attributable to Parent Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Liabilities and Equity Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Gains and Losses on Derivative Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Reconciliation Of Accumulated Comprehensive Income Reconciliation Of Accumulated Comprehensive Income [Abstract] Reconciliation Of Accumulated Comprehensive Income [Abstract] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income (loss) to: AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Interest expense Other income and (expenses) Other Income Other Comprehensive Income Other Comprehensive Income (Loss), Net of Tax Net current-period Other comprehensive (income) loss attributable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party Related Party [Member] Related Party [Member] Related Party Transaction Related Party Transaction [Line Items] Amounts Included in the Consolidated Statements of Operations Operating Expenses [Abstract] Asset management fees Asset Management Costs Available Cash Distributions Personnel and overhead reimbursements Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Interest expense on deferred acquisition fees and accretion of interest on annual distribution and shareholder servicing fee Interest Expense, Related Party Director compensation Share-based Compensation Acquisition expenses Business Combination, Acquisition Related Costs Operating expenses Related Parties Fees Paid And Expenses Reimbursed Included In Operating Expenses Expenses incurred during the period for related party transactions included in operating expenses. Acquisition Fees Capitalized Transaction Fees Incurred [Abstract] Transaction Fees Incurred [Abstract] Current acquisition fees Current Acquisition Fees Amount of current acquisition fees recognized in the period arising from acquisitions. Deferred acquisition fees Deferred Acquisition Fees Amount of deferred acquisition fees recognized in the period arising fom acquisitions. Personnel and overhead reimbursements Capitalized Personnel and Overhead Reimbursements Capitalized Personnel and Overhead Reimbursements Transaction fees incurred Transaction Fees Incurred Total amount of fees incurred to the advisor for structuring and negotiating investments and related mortgage financing that are capitalized. Third Party [Axis] Third Party [Axis] Third Party Axis Third Party [Domain] Third Party [Domain] Third Party Domain Third Party Third Party [Member] Third Party [Member] W.P. Carey W.P. Carey [Member] W.P. Carey [Member] Advisor Advisor [Member] Advisor [Member] LIBOR London Interbank Offered Rate (LIBOR) [Member] Related Party Fees Basis [Axis] Related Party Fees Basis [Axis] -- None. No documentation exists for this element. -- Related Party Fees Basis [Domain] Related Party Fees Basis [Domain] -- None. No documentation exists for this element. -- Average market value of investment Average Market Value Of Investment [Member] Average Market Value Of Investment [Member] Average equity value of investment Average Equity Value Of Investment [Member] Average Equity Value Of Investment [Member] Real estate commission Real Estate Commission [Member] Real Estate Commission [Member] Contract sales price of investment Contract Sales Price Of Investment [Member] Contract Sales Price Of Investment [Member] Average invested asset Average Invested Assets [Member] Average invested assets Adjusted net income Adjusted Net Income [Member] Adjusted Net Income [Member] Inception Year [Axis] Inception Year [Axis] Inception Year [Domain] Inception Year [Domain] 2017 Year one [Member] Interest rate on first year of loan Settlement Term [Axis] Settlement Term [Axis] -- None. No documentation exists for this element. -- Settlement Term [Domain] Settlement Term [Domain] -- None. No documentation exists for this element. -- Current Current [Member] Current [Member] Deferred Deferred [Member] Deferred [Member] Maximum line of credit approved by directors Line of Credit Facility, Maximum Borrowing Capacity Loan from related party Notes Payable, Related Parties Percentage of asset management fees Percentage Of Asset Management Fees The percentage fee paid to the advisor for managing the company's assets based on the average market value or average equity value, as applicable, depending on the type of investments. Net asset value (per share) Net Asset Value Per Share The price per share on shares issued to the advisor for asset management fees. Number of shares held by advisor (shares) Advisor owned percentage of common stock Advisor Owned Percentage Of Common Stock The percentage of the entity's common stock owned by the advisor. Due to Related Party Due to Related Parties [Abstract] Shareholder servicing fee (percentage) Shareholder Servicing Fee The percentage due to the dealer manager based on the sale of Class C Shares. Underwriting compensation limit Underwriting Compensation Limit The percentage of gross offering proceeds related to the limit on underwriting compensation prescribed by Financial Industry Regulatory Authority, Inc. Estimated future payments Shareholder Servicing Fee Payable The amount of shareholder servicing fees that are payable. Preferred return Preferred Return The advisor's preferred non-compounded cumulative distribution return per annum. Percentage of acquisition fees Percentage of Acquisition Fees The percentage of fees paid to the advisor for the structuring and negotiating investments on the company's behalf and based on the aggregate total costs of an investment for all investments other than those in readily-marketable real estate securities purchased in the secondary market. Interest rate on deferred acquisition fee Interest Rate On Deferred Acquisition Fee Interest Rate On Deferred Acquisition Fee Percentage of subordinated disposition fees Percentage Of Subordinated Disposition Fees The percentage fee based on the lesser of competitive real estate commission or the contract sales prices of the investment being sold that is paid to the advisor for services provided in connection with disposition. Maximum personnel and overhead reimbursement, percentage Maximum Personnel and Overhead Reimbursement, Percentage The percentage threshold for personnel and overhead reimbursement chargeable by the advisor for personnel cost. Personnel expenses excludes costs related to the advisor’s legal transaction group allocated. The threshold is based on pro rata revenue. Legal fee reimbursement rate Legal Fee Reimbursement Rate The percentage of total investment cost reimbursable to the advisor for legal fees. Percentage of operating expense reimbursement Percentage Of Operating Expenses Reimbursements The percentage guideline for when the advisor is required to reimburse the amount of operating expenses that exceeds the greater of the percentages for average invested assets or adjusted net income. Equity method investments ownership percentage Equity Method Investment, Ownership Percentage Statement of Cash Flows [Abstract] Cash Flows — Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows — Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Funding and advances for build-to-suit projects Payments for Construction in Process Acquisitions of real estate and direct financing leases, net of cash acquired Payments to Acquire Real Estate and Real Estate Joint Ventures Capital contributions to equity investment Payments to Acquire Equity Method Investments Change in investing restricted cash Increase (Decrease) in Restricted Cash Payment of deferred acquisition fees to an affiliate Payment Of Deferred Acquisition Fees To Affiliate Total cash payment made to the advisor for asset acquisitions during the reporting period for structuring transactions on behalf of the reporting entity. Value added taxes paid in connection with acquisition of real estate Vat Paid In Connection With Acquisition Of Real Estate Value added tax paid in connection with investments in foreign properties. Capital expenditures on real estate Payments to Develop Real Estate Assets Value added taxes refunded in connection with acquisition of real estate VAT refunded in connection with acquisitions in real estate VAT refunded to the Company in connection with acquisitions in real estate. Distributions received from equity investments in excess of earnings Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Proceeds from sale of real estate Proceeds from Sale of Real Estate Held-for-investment Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flows — Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Distributions paid Payments of Ordinary Dividends, Common Stock Proceeds from mortgage financing Proceeds from Issuance of Secured Debt Distributions to noncontrolling interests Payments to Noncontrolling Interests Repurchase of shares Payments for Repurchase of Common Stock Scheduled payments and prepayments of mortgage principal Repayments of Secured Debt Payment of deferred financing costs and mortgage deposits Payments of Financing Costs Change in financing restricted cash Proceeds from (Repayments of) Restricted Cash, Financing Activities Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Net Cash Provided by Financing Activities Net Cash Provided by (Used in) Financing Activities Change in Cash and Cash Equivalents During the Period Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Stock-based Compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Distributions Declared Equity Distributions [Abstract] Equity Distributions [Abstract] Dividend payable, date Dividends Payable, Date to be Paid Risk Management and Use of Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Derivatives in Cash Flow Hedging Relationships Foreign currency forward contracts and collars Foreign Exchange Forward [Member] Foreign currency collars Foreign Currency Collars II [Member] Foreign Currency Collars II [Member] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Euro Euro Member Countries, Euro NOK Norway, Krone Derivative Derivative [Line Items] Number of Instruments Derivative, Number of Instruments Held Notional Amount Derivative, Notional Amount Fair value Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Debt Debt Instrument, Fair Value Disclosure Note receivable Notes Receivable, Fair Value Disclosure Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other assets, net Other Assets [Member] Accounts payable, accrued expenses and other liabilities Accounts Payable and Accrued Liabilities [Member] Derivatives, Fair Value Derivatives, Fair Value [Line Items] Derivative asset fair value Derivative Asset, Fair Value, Gross Asset Derivative liability, fair value Derivative Asset, Fair Value, Gross Liability Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest expense Interest Expense [Member] Other income Other Operating Income (Expense) [Member] Individual Counterparty Individual Counterparty [Member] Derivative Cash collateral posted Derivative Asset, Collateral, Obligation to Return Cash, Offset Estimated amount of derivative income loss to be reclassified to interest expense in the next 12 months Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Derivative instrument remaining maturity period Derivative, Remaining Maturity Collateral received Derivative, Collateral, Obligation to Return Cash Total credit exposure Credit Derivative, Maximum Exposure, Undiscounted Derivative in net liability position Derivative, Net Liability Position, Aggregate Fair Value Termination value of assets Assets Needed for Immediate Settlement, Aggregate Fair Value Due to Related Parties [Abstract] Loan from WPC, including interest Deferred acquisition fees, including interest Offering And Offering Costs Unpaid The total start-up cost incurred in connection with the initial public offering, that is due to the advisor. Shareholder servicing fee liability Accounts payable and other Deferred Acquisition Fees Due To The Advisor Amount of deferred acquisition fees recognized, but have not yet been paid, arising from acquisitions. Current acquisition fees Current Acquisition Fees Payable The current amount of fees due to affiliates for structuring and negotiating investments on their behalf. Asset management fees payable Asset Management Fees Due To The Advisor The amount of asset management fees payable to the advisor. Due to affiliate Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] USD United States of America, Dollars Fair value Interest Rate Derivatives, at Fair Value, Net Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares outstanding (shares) Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Schedule Of Other Financial Instruments In Carrying Values And Fair Values Schedule Of Other Financial Instruments In Carrying Values And Fair Values [Table Text Block] Tabular disclosure of other financial instruments at carrying value and fair value. Schedule of Real Estate Properties Schedule of Real Estate Properties [Table Text Block] Real Estate Under Construction Other Real Estate, Roll Forward [Table Text Block] Statement of Comprehensive Income [Abstract] Other Comprehensive Income Change in net unrealized loss on derivative instruments Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Amounts Attributable to Noncontrolling Interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Net income Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income Attributable to CPA®:18 – Global Comprehensive Income (Loss), Net of Tax, Attributable to Parent Goodwill Goodwill [Roll Forward] Goodwill - beginning balance Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Goodwill - ending balance Long-term Debt, Fiscal Year Maturity Long-term Debt, Fiscal Year Maturity [Abstract] 2017 (remainder) Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2018 Long-term Debt, Maturities, Repayments of Principal in Year Two 2019 Long-term Debt, Maturities, Repayments of Principal in Year Three 2020 Long-term Debt, Maturities, Repayments of Principal in Year Four 2021 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter through 2039 Long-term Debt, Maturities, Repayments of Principal after Year Five Long term debt gross Long-term Debt, Gross Deferred financing costs Unamortized premium, net Debt Instrument, Unamortized Discount (Premium), Net Total Long-term Debt Schedule of Debt Maturities Schedule of Maturities of Long-term Debt [Table Text Block] Other income and (expenses) Amount of Gain (Loss) on Derivatives Reclassified from Other Comprehensive Income into Income (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] Amount of Gain (Loss) on Derivatives Reclassified from Other Comprehensive Income into Income (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Revenues Revenues [Abstract] Lease revenues: Real Estate Revenue, Net [Abstract] Rental income Operating Leases, Income Statement, Lease Revenue Total lease revenue Real Estate Revenue, Net Other real estate income Other Operating Income Other operating income Other Real Estate Revenue Other interest income Interest Income, Other Total revenues Operating Expenses Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Other real estate expenses Other Cost of Operating Revenue Property expenses Occupancy, Net General and administrative General and Administrative Expense Acquisition and other expenses Operating Expenses Other Income and Expenses Nonoperating Income (Expense) [Abstract] Interest expense Other income and (expenses) Other Nonoperating Income (Expense) Equity in losses of equity method investment in real estate Income (Loss) from Equity Method Investments Other Income and Expenses Nonoperating Income (Expense) Income (loss) before income taxes and loss on sale of real estate Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income (loss) before loss on sale of real estate Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss on sale of real estate, net of tax Net Income (Loss) Net income attributable to noncontrolling interests (inclusive of Available Cash Distributions to a related party of $1,675 and $1,277, respectively) Basic and diluted weighted-average shares outstanding Weighted Average Number of Shares Outstanding, Basic and Diluted Net income (loss) per share (in dollars per share) Earnings Per Share, Basic and Diluted Segment Reporting Segment Reporting Disclosure [Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule Of Intangible Assets and Liabilities Schedule Of Intangible Assets Liabilities [Table Text Block] Tabular disclosure of intangible assets and liabilities, which may be broken down by segment or major class. Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Recently Adopted Accounting Policy New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Description of New Accounting Pronouncements Not yet Adopted [Text Block] Intangible Assets and Liabilities Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Derivatives Derivatives, Policy [Policy Text Block] Class of Stock [Domain] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Basic and Diluted Earnings Per Share, Basic and Diluted [Abstract] Weighted-Average Shares Outstanding (shares) Net Income (Loss) Attributable to CPA®:18 – Global Basic and diluted income (loss) per share (in dollars per share) Equity method investments Equity Method Investments [Member] Variable interest entities, count Variable Interest Entities, Count The number of variable interest entities held by the company as of the balance sheet date. Variable interest entities consolidated, count Variable Interest Entities Consolidated, Count The number of variable interest entities held by the company as of the balance sheet date which are consolidated. Variable interest entities unconsolidated, count Variable Interest Entities Unconsolidated, Count The number of variable interest entities held by the company as of the balance sheet date which are unconsolidated. Fair Value Measurements Fair Value Disclosures [Text Block] Build To Suit Project New Build To Suit Projects [Member] New Build To Suit Projects [Member] Build To Suit Expansion Build To Suit Expansion [Member] Build To Suit Expansion [Member] Warehouse in Iowa City, IA Warehouse in Iowa City, Iowa [Member] Warehouse in Iowa City, Iowa [Member] University in Accra, Ghana University in Accra, Ghana [Member] University in Accra, Ghana [Member] Land in Vaughan, Ontario, Canada Vaughan, Ontario, Canada [Member] Vaughan, Ontario, Canada [Member] US Treasury US Treasury Notes Securities [Member] Funding Axis [Axis] Funding [Axis] Funding Axis Funding Axis [Domain] Funding Axis [Domain] [Domain] for Funding Axis [Axis] Initial Funding Initial Funding [Member] Initial Funding [Member] Noncash investing Noncash [Member] Noncash [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Acquisition Acqusition [Abstract] -- None. No documentation exists for this element. -- Depreciation expense Depreciation Ownership interest In joint venture Ownership Interest In Joint Venture The ownership interest in jointly owned investments by the reporting entity. Investment purchase price Investment Purchase Price The total cost to acquire investments. In instances where the acquired investment is categorized as a business combination the investment price excludes fees and expenses related to the acquisition, whereas when the investment is categorized as an real estate acquisition the acquisition fees are capitalized. Intangible assets acquired Finite-lived Intangible Assets Acquired Capitalized acquisition cost Acquisition Costs, Period Cost Accrued liabilities Accrued Liabilities Contractual Obligation Contractual Obligation Construction loan Construction Loan Placed into service Number of BTS projects Number Of Construction Projects During Period The number of construction projects currently in progress. Unfunded commitment Unfunded Commitment Amount of commitment unfunded as of the balance sheet date. Equity method investment counterparty ownership percentage Equity Method Investment, Counterparty Ownership Percentage Equity Method Investment, Counterparty Ownership Percentage Equity method investment, liabilities Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities Organization Nature of Operations [Text Block] Acquired Finite-Lived Intangible Assets and Liabilities Acquired Finite Lived Intangible Assets Liabilities [Line Items] Acquired Finite Lived Intangible Assets Liabilities Net amortization of intangibles Net Amortization Of Intangibles The aggregate expense charged against earnings to allocate the cost of intangible assets and liabilities (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Derivatives Not in Cash Flow Hedging Relationships Not Designated as Hedging Instrument [Member] Amount of Gain (Loss) on Derivatives Recognized in Income Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] Amount of Gain (Loss) on Derivatives Recognized in Income Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net