Real Estate Held for Investment [Abstract] Real Estate Held for Investment [Abstract] Investment [Table] Investment [Table] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] GKK Properties [Member] GKK Properties [Member] GKK Properties [Member] Major Property Class [Axis] Major Property Class [Axis] Major Property Class [Domain] Major Property Class [Domain] Held for Non-Sale Disposition [Member] Held for Non-Sale Disposition [Member] Held for Non-Sale Disposition [Member] Real Estate Loans by Name [Axis] Real Estate Loans by Name [Axis] Real Estate Loans by Name [Axis] Real Estate Loans by Name [Domain] Real Estate Loans by Name [Domain] Real Estate Loans by Name [Domain] Goldman Mortgage Loan [Member] Goldman Mortgage Loan [Member] Goldman Mortgage Loan [Member] Investment [Line Items] Investment [Line Items] Assets Assets [Abstract] Total real estate, at cost and net of impairment charges Real Estate Investment Property, at Cost Accumulated depreciation/amortization Real Estate Investment Property, Accumulated Depreciation Total real estate, net Total Real Estate The net book value of real estate held for investment purposes and real estate held for sale. Restricted cash Restricted Cash and Cash Equivalents Above-market leases, net Above Market Leases, Net This element represents an asset associated with the acquisition of an off-market lease when the terms of the lease are favorable to the market terms for the lease at the date of acquisition. Other assets Other Assets Total assets Assets Liabilities Liabilities [Abstract] Notes payable Notes Payable Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Below-market leases, net Off-market Lease, Unfavorable Other liabilities Other Liabilities Total liabilities Liabilities Subordinated interest Subordinated Interest A loan secured by another claim and subordinate to a senior interest. Receivables [Abstract] REAL ESTATE LOANS RECEIVABLE Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization [Abstract] Continuing operations Depreciation, Depletion and Amortization Discontinued operations Depreciation and Amortization, Discontinued Operations Income from unconsolidated joint venture Income (Loss) From Unconsolidated Joint Venture Income (loss) from unconsolidated joint venture. Distribution of earnings from unconsolidated joint venture Proceeds from Equity Method Investment, Dividends or Distributions Impairment charges on real estate - continuing operations Impairment of Real Estate Impairment charges on real estate - discontinued operations Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax Amortization of investment in master lease Amortization of Investment Master Lease Represents the amortization of the cost of a master lease during the period. The cost of a master lease is being amortized on a straight-line basis over the life of the lease. Noncash interest income on real estate-related investments Noncash interest income on real estate related investments The sum of accretion between debt investments and purchase prices that are charged against earnings and the amortization of costs and fees directly associated with the origination or acquisition of the debt investments. As a noncash item, this element is an adjustment to net income when calculating cash provided by (used in) operations using the indirect method. Change in provision for loan losses Increase (decrease) in provision for loan losses The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected), offset by any collections for loans previously written off. Deferred rent Recognition of Deferred Revenue Bad debt expense Provision for Doubtful Accounts Amortization of deferred financing costs Amortization of Financing Costs Amortization of above- and below-market leases, net Amortization of Intangible Assets Amortization of cost of derivative instruments Unrealized Gain (Loss) on Derivatives Gain on sales of foreclosed real estate held for sale Gain On Sale Of Foreclosed Real Estate Held For Sale Gain (loss) recognized in the sale of real estate obtained through foreclosure Gain on sales of real estate, net Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Gain on sales of real estate securities Gain on Sale of Real Estate Securities Gain on Sale of Real Estate Securities Gain on extinguishment of debt Gains (Losses) on Extinguishment of Debt Amortization of discount and premium on notes payable, net Amortization of Debt Discount (Premium) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Restricted cash for operational expenditures Increase (Decrease) in Restricted Cash for Operating Activities Rents and other receivables Increase (Decrease) in Accounts Receivable Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Due to affiliates Increase (Decrease) in Due to Related Parties Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Improvements to real estate Payments for Capital Improvements Proceeds from sales of real estate, net Proceeds from Sale of Real Estate Proceeds from sales of foreclosed real estate held for sale Proceeds from Sale of Foreclosed Assets Proceeds from sale of real estate loans receivable Proceeds from Sale of Loans Receivable Investments in real estate loans receivable Payments to Acquire Loans Receivable Principal repayments on real estate loans receivable Mortgage Loans on Real Estate, Collections of Principal Extension fees related to real estate loans receivable Extension Fees Related To Real Estate Loans Receivable Extension fees related to real estate loans receivable Proceeds from sale of real estate securities Proceeds from Sale and Maturity of Available-for-sale Securities Purchases of pledged securities Payments to Acquire Held-to-maturity Securities Maturities of pledged securities Proceeds from Sale and Maturity of Held-to-maturity Securities Cash received from the Transfer of the GKK Properties Cash Received From Transfer of Real Estate Cash inflow related to amounts received from transfer of real estate properties Net change in restricted cash for capital expenditures Increase (Decrease) in Restricted Cash Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from notes payable Proceeds from Notes Payable Principal payments on notes payable Repayments of Notes Payable Principal payments on repurchase agreements Principal Payments on Repurchase Agreements The cash outflow from the payment of debt due under repurchase agreements Net change in restricted cash for debt service obligations Restricted cash for debt service obligations Restricted cash for debt service obligations. Payments of deferred financing costs Payments of Financing Costs Payments to redeem common stock Payments for Repurchase of Common Stock Payments of commissions on stock issuances and other offering costs Payments of commissions on stock issuances Payments of commissions on stock issuances Distributions paid to common stockholders Payments of Ordinary Dividends, Common Stock Distributions paid to noncontrolling interest Payments of Ordinary Dividends, Noncontrolling Interest Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Discontinued Operations and Disposal Groups [Abstract] Total revenues and other income Revenue and Other Income, Discontinued Operations Revenue and other income, discontinued operations. Total expenses Cost and Expense, Discontinued Operations Cost and expense, discontinued operations. Income (loss) from discontinued operations before gain on sales of real estate, net and impairment charge Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Gain on sales of real estate, net Impairment charge Gain from extinguishment of debt Total gain (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Mortgage Loans on Real Estate Schedule [Table] Mortgage Loans on Real Estate Schedule [Table] Sale to Unaffiliated Buyer [Member] Sale to Unaffiliated Buyer [Member] Sale to Unaffiliated Buyer [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate, Property Type [Domain] Real Estate, Property Type [Domain] Office Building [Member] Office Building [Member] 11 South LaSalle Loan Chicago, Illinois [Member] 11 South LaSalle Loan Chicago, Illinois [Member] 11 South LaSalle Loan Chicago, Illinois [Member] Mortgage Loans on Real Estate [Line Items] Mortgage Loans on Real Estate [Line Items] Mortgage loans on real estate Mortgage Loans on Real Estate, Face Amount of Mortgages Rentable square footage of real estate property Rentable Square Footage of Real Estate Property Rentable Square Footage of Real Estate Property Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Notional and Fair Value of Interest Rate Swaps Designated as Cash Flow Hedges Schedule of Interest Rate Derivatives [Table Text Block] Future Minimum Lease Payments, Non-Cancelable Operating Leases Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Schedule of Real Estate Loans Receivable Schedule of Real Estate Loans Receivable [Table Text Block] Schedule of Real Estate Loans Receivable [Table Text Block] Schedule of Activity Related to Real Estate Loans Receivable Schedule of Activity Related to Real Estate Loans Receivable [Table Text Block] Schedule of Activity Related to Real Estate Loans Receivable [Table Text Block] Schedule of Interest Income from Real Estate Loans Receivable Interest and Other Income [Table Text Block] Schedule of Changes in Reserve for Loan Losses Schedule of Changes in Reserve for Loan Losses [Table Text Block] Schedule of Changes in Reserve for Loan Losses [Table Text Block] Notes Payable and Repurchase Agreements [Abstract] Notes Payable and Repurchase Agreements [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] One Citizens Loan [Member] One Citizens Loan [Member] One Citizens Loan [Member] BOA Windsor Mortgage Portfolio [Member] BOA Windsor Mortgage Portfolio [Member] BOA Windsor Mortgage Portfolio [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Matured debt and other liabilities Matured Debt and Other Liabilities Matured Debt and Other Liabilities Real estate properties of which loans had matured, and other assets Real Estate Properties of Which Loans Had Matured, and Other Assets Real Estate Properties of Which Loans Had Matured, and Other Assets Gain on debt settlement Gain (Loss) on Debt Settlement Gain (Loss) on Debt Settlement Gain on disposal of real estate Gain (Loss) on Sale of Real Estate Gain (Loss) on Sale of Real Estate Extinguishment of debt, gain per share Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax Possible late fee Possibility of Late Fee in Addition to Outstanding Balance Possibility of Late Fee in Addition to Outstanding Balance Real estate at carrying value Real Estate, Carrying Value Real estate, carrying value. Mortgage loan, amount held In reserve Mortgage Loan, Amount Held In Reserve Mortgage Loan, Amount Held In Reserve Statement of Other Comprehensive Income [Abstract] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Reclassification of realized gain on real estate securities Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax Unrealized change in market value of real estate securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Unrealized gains on derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Total comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Segment Reporting [Abstract] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Schedule of Operating Income from Discontinued Operations Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Schedule of Major Components of Real Estate Held for Sale and Liabilities Related to Real Estate Held for Sale Schedule of Major Components of Real Estate Held for Sale and Liabilities Related to Real Estate Held for Sale [Table Text Block] Schedule of major components of real estate held for sale and liabilities related to real estate held for sale. Investments, Debt and Equity Securities [Abstract] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Fixed Rate Securities [Member] Fixed Rate Securities [Member] Fixed Rate Securities [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Held-to-maturity securities, carrying value Held-to-maturity Securities Pledged as Collateral Held-to-maturity securities, fair value Held-to-maturity Securities, Fair Value Cupon rate Available-for-sale Security, Fixed Income Investment, Interest Rate, Stated Percentage Available-for-sale security, fixed income investment, interest rate, stated percentage. Available-for-sale securities Available-for-sale Securities Available-for-sale securities, other-than-temporary impairments Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Available-for-sale securities, unrealized gains Available-for-sale Securities, Gross Unrealized Gains Available-for-sale securities, fair value Available-for-sale Securities, Fair Value Disclosure Available-for-sale securities, realized gains Available-for-sale Securities, Gross Realized Gains Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Industry - Finance [Member] Industry - Finance [Member] Industry - Finance [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of Tenants Number of Tenants Number of tenants. Annualized Base Rent Annualized Base Rent Annualized base rent. Percentage of Annualized Base Rent Concentration Risk, Percentage Foreclosed Real Estate Held for Sale [Abstract] Foreclosed Real Estate Held for Sale [Abstract] FORECLOSED REAL ESTATE HELD FOR SALE Foreclosed Real Estate Held for Sale [Text Block] Foreclosed Real Estate Held for Sale [Text Block] Schedule of Real Estate Investments Schedule of Real Estate Properties [Table Text Block] Schedule of Future Minimum Rental Income Under Non-cancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedules of Concentration of Risk, by Risk Factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Schedule of Revenue and Expenses Related to Properties Held for Non-Sale Disposition Schedule of Revenue and Expenses Related to Properties Held for Non-Sale Disposition [Table Text Block] Schedule of Revenue and Expenses Related to Properties Held for Non-Sale Disposition [Table Text Block] Schedule of Assets and Liabilities Related to Properties Held for Non-Sale Disposition Schedule of Assets and Liabilities Related to Properties Held for Non-Sale Disposition [Table Text Block] Schedule of Assets and Liabilities Related to Properties Held for Non-Sale Disposition [Table Text Block] Derivative [Table] Derivative [Table] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] One-month LIBOR/Fixed at 3.82% [Member] One-month LIBOR Fixed at 3 Point 82 Percent [Member] One-month LIBOR/Fixed at 3.82% [Member] One-month LIBOR/Fixed at 2.26% [Member] One-month LIBOR Fixed at 2 Point 26 Percent [Member] One-month LIBOR/Fixed at 2.26% [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Derivative [Line Items] Derivative [Line Items] Effective Date Derivative, Inception Date Maturity Date Derivative, Maturity Date Notional Value Notional Amount of Interest Rate Derivatives Description of variable rate basis Derivative, Description of Variable Rate Basis Fixed interest rate Derivative, Fixed Interest Rate Fair Value of Asset (Liability) Interest Rate Cash Flow Hedge Derivative at Fair Value, Net Recognized additional interest expense Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Additional interest expense Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Accounting Policies [Abstract] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Real Estate Properties [Line Items] Real Estate Properties [Line Items] Number of real estate properties held for sale Number of Real Estate Properties Held for Sale Number of real estate properties held for sale. Number of real estate properties disposed Number of real estate properties disposed Number of real estate properties disposed. Number of real estate properties reclasified from held-for-sale to held for investment Number of Real Estate Properties Reclasified from Held-for-Sale to Held for Investment Number of real estate properties reclasified from held-for-sale to held for investment. Distribution rate per share per day, declared Common Share, Distribution Rate Per Share Per Day, Declared Common share, distribution rate per share per day, declared. Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Domain] Investment Type Categorization [Domain] Mortgages [Member] Mortgages [Member] Mortgage Loan on Real Estate, Loans, Rate Type [Axis] Mortgage Loan on Real Estate, Loans, Rate Type [Axis] Mortgage Loan on Real Estate, Loans, Rate Type [Axis] Mortgage Loan on Real Estate, Loans, Rate Type [Domain] Mortgage Loan on Real Estate, Loans, Rate Type [Domain] Mortgage Loan on Real Estate, Loans, Rate Type [Domain] Fixed Rate [Member] Fixed Rate [Member] Fixed Rate [Member] Variable Rate [Member] Variable Rate [Member] Variable Rate [Member] Mezzanine [Member] Mezzanine [Member] Mezzanine [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Mortgage [Member] Notes Payable [Member] Notes Payable, Other Payables [Member] Repurchase agreements Repurchase Agreements The carrying value as of the balance sheet date of securities or loans that an institution sells and agrees to repurchase (the identical or substantially the same securities or loans) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement or repo. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repurchase agreements. Notes payable and repurchase agreements, gross Notes Payable and Repurchase Agreements, Gross Notes payable and repurchase agreements, gross. Discount on notes payable, net Debt Instrument, Unamortized Discount (Premium), Net Total Notes Payable and Repurchase Agreements, net Total Notes Payable and Repurchase Agreements Total notes payable and repurchase agreements. Contractual interest rate, minimum Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum Contractual interest rate, maximum Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum Interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Weighted-Average Interest Rate Debt, Weighted Average Interest Rate Term of credit facility Term of credit facility Term of credit facility. Description of variable rate, basis Debt Instrument, Description of Variable Rate Basis Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Held-for-Investment [Member] Held for Investment [Member] Held for Investment [Member] Assets Held-for-sale [Member] Assets Held-for-sale [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value, Disclosure Item Amounts [Domain] Estimated Sales Prices Less Costs to Sell [Member] Estimated Sales Prices Less Costs to Sell [Member] Estimated Sales Prices Less Costs to Sell [Member] Obtaining and Reviewing Broker Estimated [Member] Obtaining and Reviewing Broker Estimated [Member] Obtaining and Reviewing Broker Estimated [Member] Type of Occupancy [Axis] Type of Occupancy [Axis] Type of Occupancy [Axis] Type of Occupancy [Domain] Type of Occupancy [Domain] Type of Occupancy [Domain] Stabilized [Member] Stabilized [Member] Stabilized [Member] Unstabilized [Member] Unstabilized [Member] Unstabilized [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Impairment charge Impairment losses on real estate held-for-investment, number of properties Impairment of Real Estate Properties Held-for-Investment, Number of Properties Impairment of Real Estate Properties Held-for-Investment, Number of Properties Impairment losses on real estate held-for-sale, number of properties Impairment of Real Estate Properties Held-for-Sale, Number of Properties Impairment of real estate properties held-for-sale, number of properties. Weighted average terminal capitalization rate Weighted Average Terminal Capitalization Rate Weighted Average Terminal Capitalization Rate REAL ESTATE HELD FOR INVESTMENT Real Estate Disclosure [Text Block] BBD2 Loan and Jenkins Loan [Member] BBD2 Loan and Jenkins Loan [Member] BBD2 Loan and Jenkins Loan [Member] BBD2 Loan [Member] BBD2 Loan [Member] BBD2 Loan [Member] Jenkins Loan [Member] Jenkins Loan [Member] Jenkins Loan [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Mortgage loans on eeal estate, number of loans Mortgage Loans on Real Estate, Number of Loans Subsequent Events [Abstract] SUBSEQUENT EVENTS Subsequent Events [Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Net Income (Loss) to Net Operating Income (Loss) Reconciliation of Net Income (Loss) to Net Operating Income (Loss), Segment Reporting [Table Text Block] Reconciliation of Net Income (Loss) to Net Operating Income (Loss), Segment Reporting [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans on Real Estate, Loan Type [Domain] Mortgage Loans on Real Estate, Loan Type [Domain] B-Note [Member] B-Note [Member] B-Note [Member] Subordinated [Member] Subordinated [Member] Subordinated [Member] Sandmar Mezzanine Loan Southeast U.S. [Member] Sandmar Mezzanine Loan Southeast U.S. [Member] Sandmar Mezzanine Loan Southeast U.S. [Member] Lawrence Village Plaza Loan Origination New Castle, Pennsylvania [Member] Lawrence Village Plaza Loan Origination New Castle, Pennsylvania [Member] Lawrence Village Plaza Loan Origination New Castle, Pennsylvania [Member] San Diego Office Portfolio B-Note San Diego, California [Member] San Diego Office Portfolio B-Note San Diego, California [Member] San Diego Office Portfolio B-Note San Diego, California [Member] 4929 Wilshire B-Note Los Angeles, California [Member] 4929 Wilshire B-Note Los Angeles, California [Member] 4929 Wilshire B-Note Los Angeles, California [Member] Petra Subordinated Debt Tranche A [Member] Petra Subordinated Debt Tranche A [Member] Petra Subordinated Debt Tranche A [Member] Petra Subordinated Debt Tranche B [Member] Petra Subordinated Debt Tranche B [Member] Petra Subordinated Debt Tranche B [Member] Petra Subordinated Debt Tranche A and Petra Subordinated Debt Tranche B [Member] Petra Subordinated Debt Tranche A and Petra Subordinated Debt Tranche B [Member] Petra Subordinated Debt Tranche A and Petra Subordinated Debt Tranche B [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Date Acquired/ Originated Business Acquisition, Effective Date of Acquisition Outstanding Principal Balance Mortgage Loans on Real Estate, Outstanding Pricipal Balance Mortgage loans on real estate, outstanding pricipal balance. Book Value Mortgage Loans on Real Estate, Commercial and Consumer, Gross The balance represents the gross amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. Reserve for Loan Losses Allowance for Loan and Lease Losses, Real Estate Book Value Mortgage Loans on Real Estate, Commercial and Consumer, Net Contractual Interest Rate Mortgage Loans on Real Estate, Interest Rate Annualized Effective Interest Rate Receivable with Imputed Interest, Effective Yield (Interest Rate) Maturity Date Mortgage Loans on Real Estate, Final Maturity Date Outstanding funding commitments to loan receivables Loans Receivable, Outstanding Commitment to Fund Outstanding funding commitments to loan receivables. Interest receivable Interest Receivable Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Sandmar Mezzanine Loan [Member] Sandmar Mezzanine Loan [Member] Sandmar Mezzanine Loan [Member] 200 Professional Drive Loan [Member] 200 Professional Drive Loan [Member] 200 Professional Drive Loan [Member] Portfolio Segment [Axis] Portfolio Segment [Axis] Financing Receivable Allowance [Domain] Financing Receivable Allowance [Domain] Portfolio Basis [Member] Portfolio Basis [Member] Portfolio Basis [Member] Reserve for loan losses, Beginning Balance Provision for loan losses Allowance for Loan and Lease Losses, Provision for Loss, Net Charge-offs to reserve for loan losses Allowance for Loan and Lease Losses, Write-offs Reserve for loan losses, Ending Balance Mortgage loans on real estate, amortized cost basis Mortgage loans on real estate, amortized cost basis Mortgage loans on real estate, amortized cost basis. Reduction in provision for loan losses Allowance for Loan and Lease Losses, Period Increase (Decrease) Recovery of reserves for loan losses Allowance for Loan and Lease Losses, Recoveries of Bad Debts Number of real estate properties Number of Real Estate Properties Total revenues Revenues Operating expenses Cost of Real Estate Revenue Depreciation and amortization Total expenses Costs and Expenses Net loss Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Total Stockholders' Equity Parent [Member] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Cumulative Distributions and Net Income (Loss) [Member] Accumulated Distributions in Excess of Net Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, shares Balance, value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) Distributions to noncontrolling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Issuance of common stock, shares Stock Issued During Period, Shares, New Issues Issuance of common stock, value Stock Issued During Period, Value, New Issues Redemptions of common stock, shares Stock Redeemed or Called During Period, Shares Redemptions of common stock, value Stock Redeemed or Called During Period, Value Transfers to redeemable common stock Adjustments To Additional Paid In Capital Transfers To Redeemable Common Stock Transfers of common stock to redeemable common shares that are contingently redeemable at the option of the holder. Distributions declared Dividends, Common Stock Commissions on stock issuances to affiliate Commissions on stock sales and related dealer manager fees The sum of commissions on stock issuances and related dealer manager fees charged against APIC. Other offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Balance, shares Balance, value REAL ESTATE HELD FOR SALE AND DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Office Properties and Operations Centers [Member] Office Properties and Operations Centers [Member] Office Properties and Operations Centers [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] BBD1 Owner [Member] BBD1 Owner [Member] BBD1 Owner [Member] Gramercy Capital Corp [Member] Gramercy Capital Corp [Member] Gramercy Capital Corp [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] BBD1 Equity Interests [Member] BBD1 Equity Interests [Member] BBD1 Equity Interests [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Number of Real Estate Properties, Indirectly Owned Number of Real Estate Properties, Indirectly Owned Number of Real Estate Properties, Indirectly Owned Purchase Price of Membership Interest Purchase Price of Membership Interest Purchase Price of Membership Interest Reduction in Purchase Price Reduction in Purchase Price Reduction in Purchase Price Sales Agreement, Ceiling on Owner Obligation to Cover Excess Securities to Mortgage Sales Agreement, Ceiling on Owner Obligation to Cover Excess Securities to Mortgage Sales Agreement, Ceiling on Owner Obligation to Cover Excess Securities to Mortgage Sale Agreement, Equity Interest Issued or Issuable, Number of Shares Issued Sale Agreement, Equity Interest Issued or Issuable, Number of Shares Issued Sale Agreement, Equity Interest Issued or Issuable, Number of Shares Issued Share Price Share Price Supplemental Cash Flow and Significant Noncash Transaction Disclosures [Abstract] Supplemental Cash Flow and Significant Noncash Transaction Disclosures [Abstract] Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Supplemental Disclosure of Significant Noncash Transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Decrease in distributions payable Increase (Decrease) in distributions payable Increase (decrease) in distributions payable. Increase in capital expenses payable Increase (Decrease) in capital expenses payable Increase (decrease) in capital expenses payable. Mortgage loan satisfied in connection with deed in lieu of foreclosure Mortgage Loan Satisfied in Connection with Deed in Lieu of Foreclosure Mortgage loan satisfied in connection with deed in lieu of foreclosure. Distributions paid to common stockholders through common stock issuances pursuant to the dividend reinvestment plan Distributions paid to common stockholders through common stock issuances pursuant to the dividend reinvestment plan The sum of distributions paid to common stockholders through common stock issuances. Transfer to property Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Liabilities related to property Liabilities Assumed Pledged government securities Pledged Government Securities Pledged government securities. Restricted cash Restricted Cash Restricted cash. Accounts payable and other liabilities Accounts Payable and Other Liabilities Accounts payable and other liabilities. Accounts receivable and assets Accounts Receivable and Assets Accounts receivable and assets. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Significant Accounting Policies [Text Block] General and administrative expenses General and Administrative Expense Gain on sale of real estate securities Gain (Loss) on Sale of Real Estate Securities Gain (loss) on sale of real estate securities. Other interest income Investment Income, Interest Impairment charge on real estate held for investment Provision for loan losses Provision for Loan and Lease Losses Total (income) loss from discontinued operations Total net operating income Operating Income (Loss) Real Estate [Member] Real Estate [Member] Always Classified as Held for Investment [Member] Always Classified as Held for Investment [Member] Always Classified as Held for Investment [Member] Since Classification as Held for Investment [Member] Since Classification as Held for Investment [Member] Since Classification as Held for Investment [Member] Properties Reclassified from Held for Sale to Held for Investment [Member] Properties Reclassified from Held for Sale to Held for Investment [Member] Properties Reclassified from Held for Sale to Held for Investment [Member] Impairment losses on real estate, number of properties Related Party Transactions [Abstract] Schedule of Related Party Costs Schedule of Related Party Transactions [Table Text Block] NOTES PAYABLE AND REPURCHASE AGREEMENTS Notes Payable and Repurchase Agreements [Text Block] Notes Payable and Repurchase Agreements [Text Block] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Carrying Amount [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value [Member] Portion at Fair Value, Fair Value Disclosure [Member] Real estate loans receivable, Face Value Real estate loans receivable, Value Loans Receivable, Fair Value Disclosure Pledged government securities, Face Value Trading Securities Pledged as Collateral, Face Amount Trading securities pledged as collateral, face amount. Pledged government securities, Value Notes payable and repurchase agreements, Face Value Notes payable and repurchase agreements, Value Activity Related to Notes Payable and Repurchase Agreements [Roll Forward] Activity Related to Notes Payable and Repurchase Agreements [Roll Forward] Activity Related to Notes Payable and Repurchase Agreements [Roll Forward] Notes Payable And Notes Payable Related To Real Estate Held For Sale, Beginning Balance Notes Payable And Notes Payable Related To Real Estate Held For Sale Notes Payable And Notes Payable Related To Real Estate Held For Sale Principal Repayments, Notes Payable Extinguishment of Debt Extinguishment of Debt, Amount Amortization of Discount on Notes Payable, Net Notes Payable And Notes Payable Related To Real Estate Held For Sale, Ending Balance Repurchase Agreements, Beginning Balance Principal Repayments, Repurchase Agreements Repayments of Repurchase Agreements Repayments of repurchase agreements. Repurchase Agreements, Ending Balance Total Notes Payable and Repurchase Agreements, Beginning Balance Principal Repayments, Notes Payable and Repurchase Agreements Repayments of Notes Payable and Repurchase Agreements Repayments of notes payable and repurchase agreements. Total Notes Payable and Repurchase Agreements, Ending Balance Tribeca Building [Member] Tribeca Building [Member] Tribeca Building [Member] Condominium Units [Member] Condominium Units [Member] Condominium Units [Member] Retail Spaces and Parking Spaces [Member] Retail Spaces and Parking Spaces [Member] Retail Spaces and Parking Spaces [Member] Number of debt investments Number of Debt Investments Number of debt investments. Number of units in condominium building Number of Units in Condominium Building Number of units in condominium building. Right of ownership interest after foreclosure, percentage Right of Ownership Interest after Foreclosure, Percentage Right of ownership interest after foreclosure, percentage. Foreclosed real estate held for sale Foreclosed Real Estate Held For Sale Carrying amounts as of the balance sheet date of land and buildings obtained through foreclosure proceedings in full or partial satisfaction of a debt arrangement and currently held for sale. Number of real estate properties sold, classified as held-for-sale Number of Real Estate Properties Sold, Classified as Held for Sale Number of real estate properties sold, classified as held for sale. Gain on sales of foreclosed real estate held for sale Gain (Loss) on Sale of Foreclosed Real Estate Held For Sale This element represents the amount of gain(loss) on properties obtained through foreclosure during the reportin period. Foreclosed real estate expense Foreclosed Real Estate Expense Expense related to foreclosed real estate held-for-sale Expense Related to Foreclosed Real Estate Held-for-Sale Expense related to foreclosed real estate held-for-sale. Statement of Financial Position [Abstract] Real estate held for investment: Real Estate Investment Property, Net [Abstract] Land Land Buildings and improvements Investment Building and Building Improvements Tenant origination and absorption costs Tenant Origination And Absorption Costs, Gross Represents the net amount of tenant origination and absorption costs. Origination costs include estimates of costs avoided associated with leasing the property, including tenant allowance and improvements and leasing commissions. Absorption costs relate to the value of opportunity costs calculated using the contractual amounts paid pursuant to in-place leases over market absorption period for a similar lease. Total real estate held for investment, at cost and net of impairment charges Less accumulated depreciation and amortization Total real estate held for investment, net Real Estate Investment Property, Net Real estate held for sale, net Real Estate Held-for-sale Real estate loans receivable, net Real estate securities Available-for-sale Securities, Debt Securities Total real estate and real estate-related investments, net Real Estate and Real Estate Related Investments Net Real estate and real estate related investments, net. Cash and cash equivalents Pledged government securities Rents and other receivables, net Accounts Receivable, Net Assets related to real estate held for sale Assets of Disposal Group, Including Discontinued Operation Deferred financing costs, prepaid expenses and other assets Deferred Financing Costs Prepaid Expenses And Other Assets Sum of the carrying amount (1) the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain, (2) expenditures paid in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs and the carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy and (3) assets not individually reported in the financial statements, or not separately disclosed in notes. Liabilities and equity Liabilities and Equity [Abstract] Notes payable and repurchase agreements: Notes payable related to real estate held for sale Liabilities of Assets Held-for-sale Total notes payable and repurchase agreements Due to affiliates Due to Related Parties Distributions payable Dividends Payable Liabilities related to real estate held for sale Liabilities related to real estate held for sale Liabilities related to real estate held for sale. Commitments and contingencies (Note 15) Commitments and Contingencies Redeemable common stock Temporary Equity, Carrying Amount, Attributable to Parent Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $.01 par value; 10,000,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Common stock, $.01 par value; 1,000,000,000 shares authorized, 191,271,397 and 190,731,533 shares issued and outstanding as of September 30, 2012 and December 31, 2011, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Cumulative distributions and net losses Accumulated Distributions in Excess of Net Income Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Estimated Capitalization Rates [Table] Estimated Capitalization Rates [Table] Estimated Capitalization Rates [Table] Real Estate Held for Investment [Member] Real Estate Held for Sale [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Estimated Capitalization Rates [Line Items] Estimated Capitalization Rates [Line Items] Estimated Capitalization Rates [Line Items] Terminal capitalization rate Fair Value Inputs, Terminal Capitalization Rate Fair value inputs, terminal capitalization rate. Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Abstract] Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Abstract] Tenant Origination and Absorption Costs, Above-Market Lease Assests and Below-Market Lease Liabiities Schedule of Finite-Lived Intangible Assets [Table Text Block] Amortization of Tenant Origination and Absorptoin Costs, Above-Market Leases and Below-Market Lease Liabilities Amortization of Tenant Origination and Absorptoin Costs, Above-Market Leases and Below-Market Lease Liabilities [Table Text Block] Amortization of Tenant Origination and Absorptoin Costs, Above-Market Leases and Below-Market Lease Liabilities [Table Text Block] October 1, 2012 through December 31, 2012 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2013 Operating Leases, Future Minimum Payments, Due in Two Years 2014 Operating Leases, Future Minimum Payments, Due in Three Years 2015 Operating Leases, Future Minimum Payments, Due in Four Years 2016 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Future Minimum Payments Due Office Properties [Member] Office Properties [Member] Office Properties [Member] Industrial Properties [Member] Industrial Properties [Member] Industrial Properties [Member] Number of real estate properties transferred Number of Real Estate Properties Transferred Number of real estate properties transferred. Impairment charges on discontinued operations Income Statement [Abstract] Revenues: Revenues [Abstract] Rental income Operating Leases, Income Statement, Lease Revenue Tenant reimbursements Tenant Reimbursements Interest income from real estate loans receivable Interest and Fee Income, Loans, Commercial, Real Estate Interest income from real estate securities Interest and Dividend Income, Securities Parking revenues and other operating income Other Real Estate Revenue Total revenues Expenses: Costs and Expenses [Abstract] Operating, maintenance, and management Real estate taxes, property-related taxes, and insurance Real Estate Taxes and Insurance Asset management fees to affiliate Asset Management Costs Interest expense Interest Expense Other income Other Income [Abstract] Gain on sales of real estate securities Income from unconsolidated joint venture Income (Loss) from Equity Method Investments Other interest income Total other income Other Income Income from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Gain on sales of real estate, net Income from discontinued operations Impairment charges on discontinued operations Net income attributable to noncontrolling interest in discontinued operations Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to common stockholders Net Income (Loss) Attributable to Parent Basic and diluted loss per common share: Earnings Per Share [Abstract] Continuing operations Income (Loss) from Continuing Operations, Per Basic and Diluted Share Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share Net loss per common share Earnings Per Share, Basic and Diluted Weighted-average number of common shares outstanding, basic Weighted Average Number of Shares Outstanding, Basic Weighted-average number of common shares oustanding, diluted Weighted Average Number of Shares Outstanding, Diluted Distributions declared per common share Common Stock, Dividends, Per Share, Declared Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Shedding Right Provisions [Axis] Shedding Right Provisions [Axis] Shedding Right Provisions [Axis] Shedding Right Provisions [Domain] Shedding Right Provisions [Domain] Shedding Right Provisions [Domain] Exercised at Various Dates (2012-2017) [Member] Exercised at Various Dates (2012-2017) [Member] Exercised at Various Dates (2012-2017) [Member] Expected to Shed in 2012 [Member] Expected to Shed in 2012 [Member] Expected to Shed in 2012 [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Liabilities [Member] Other Liabilities [Member] Weighted Average [Member] Weighted Average [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating lease, term Operating Lease, Term Describe the approximate term of operating leases. Area of land Area of Land Security deposit liability Security Deposit Liability Recognition of deferred revenue, net of discontinued operations Recognition of Deferred Revenue, Net of Discontinued Operations Recognition of Deferred Revenue, Net of Discontinued Operations Amortization of lease incentives Amortization of Lease Incentives Deferred rent receivables Deferred Rent Receivables, Net Unamortized lease incentives Incentive to Lessee Number of tenants Bad debt reserve Allowance for Doubtful Accounts Receivable Provision for doubtful accounts, percentage of base rent Provision For Doubtful Accounts, Percentage of Base Rent Provision for doubtful accounts, percentage of base rent. Provision of doubtful accounts, net of discontinued operations Provision of Doubtful Accounts, Net of Discontinued Operations Provision of Doubtful Accounts, Net of Discontinued Operations Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Two Bank Branch GKK Properties [Member] Two Bank Branch GKK Properties [Member] Two Bank Branch GKK Properties [Member] PB Capital Owner [Member] PB Capital Owner [Member] PB Capital Owner [Member] Bank Branches [Member] Bank Branches [Member] Bank Branches [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of real estate properties sold Sale price of real estate property Sale Price of Real Estate Property Sale price of real estate property. Sale of Capital Assets Sale of Capital Assets Sale of Capital Assets FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Activity Related to Notes Payable and Repurchase Agreements Schedule of Activity Related to Notes Payable and Repurchase Agreements [Table Text Block] Schedule of activity related to notes payable and repurchase agreements. Portfolio Secured Mortgage Loan Facility Borrowers [Member] Portfolio Secured Mortgage Loan Facility Borrowers [Member] Portfolio Secured Mortgage Loan Facility Borrowers [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Secured Debt [Member] Secured Debt [Member] Principal payments on notes payable Tenant Origination and Absorption Costs, Cost, net of impairments Tenant Origination and Absorption Costs, Accumulated Amortization Tenant Origination and Absorption Costs, Accumulated Amortization Tenant origination and absorption costs, accumulated Amortization Tenant Origination and Absorption Costs, Net Amount Tenant Origination and Absorption Costs, Net Tenant origination and absorption costs, net. Tenant Origination and Absorption Costs, Amortization expense Tenant origination and absorption costs, amortization expense Tenant origination and absorption costs, amortization expense. Above-Market Lease Assets, Cost, net of impairments Above-market leases, gross Above-market leases, gross. Above-Market Lease Assets, Accumulated Amortization Above-market leases, accumulated amortization Above-market leases, accumulated amortization. Above-Market Lease Assets, Net Amount Above-Market Lease Assets, Amortization expense Above-market leases, amortization expense Above-market leases, amortization expense. Below-Market Lease Liabilities, Cost, net of impairments Off-market Lease, Unfavorable, Gross Off-market lease, unfavorable, gross. Below-Market Lease Liabilities, Accumulated Amortization Off-market Lease, Unfavorable, Accumulated Amortization Off-market lease, unfavorable, accumulated amortization. Below-Market Lease Liabilities, Net Amount Below-Market Lease Liabilities, Amortization expense Off-market Lease, Unfavorable, Amortization Expense Off-market lease, unfavorable, amortization expense. Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Real Estate Segment [Member] Real estate segment [Member] Real estate segment [Member] Real Estate-Related Segment [Member] Real estate-related segment [Member] Real estate-related segment [Member] GKK Properties Segment [Member] GKK Properties Segment [Member] GKK Properties Segment [Member] Operating Segments [Member] Operating Segments [Member] Corporate-Level [Member] Corporate [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Number of states in which entity operates Number of States in which Entity Operates Revenues Assets Real estate held for sale Liabilities TENANT ORIGINATION AND ABSORPTION COSTS, ABOVE-MARKET LEASE ASSETS AND BELOW-MARKET LEASE LIABILITIES Tenant Origination and Absorption Costs, Above-Market Lease Assests and Below-Market Lease Liabiities [Text Block] Tenant Origination and Absorption Costs, Above-Market Lease Assests and Below-Market Lease Liabiities [Text Block] Contractual interest income Interest and Fee Income, Loans, Commercial Accretion of purchase discounts Accretion (Amortization) of Discounts and Premiums, Investments Amortization of origination fees and costs and acquisition costs, net Amortization of Deferred Loan Origination Fees, Net Interest income from real estate loans receivable Interest income related to impaired loans Interest Income Related to Impaired Loans with Asset-Specific Reserves Interest income related to impaired loans with asset-specific reserves. Interest receivable related to impaired loans Interest Receivable Related to Impaired Loans Interest receivable related to impaired loans. Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] KBS Strategic Opportunity REIT, Inc. [Member] KBS Strategic Opportunity REIT, Inc. [Member] KBS Strategic Opportunity REIT, Inc. [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Advisor and Dealer Manager [Member] Advisor and Dealer Manager [Member] Advisor and Dealer Manager [Member] Related Party Transactions, Accounting Recognition [Axis] Related Party Transactions, Accounting Recognition [Axis] Related Party Transactions, Accounting Recognition [Axis] Related Party Transactions, Accounting Recognition [Domain] Related Party Transactions, Accounting Recognition [Domain] Related Party Transactions, Accounting Recognition [Domain] Expensed [Member] Expensed [Member] Expensed [Member] Transaction By Type [Axis] Transaction By Type [Axis] Transaction By Type [Axis] Transaction By Type [Domain] Transaction By Type [Domain] Transaction By Type [Domain] Asset Management Fees [Member] Asset Management Fees [Member] Asset Management Fees [Member] Reimbursement of Operating Expenses [Member] Reimbursement of Operating Expenses [Member] Reimbursement of Operating Expenses [Member] Dispositon Fees [Member] Dispositon Fees [Member] Dispositon Fees [Member] Sales Commissions [Member] Sales Commissions and Fees [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Investments in a joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Expenses Related Party Transaction, Expenses from Transactions with Related Party Incurred Related Party Transaction, Amounts of Transaction Payable as of Asset management cost from discontinued operations Asset Management Cost from Discontinued Operations Asset management cost from discontinued operations. Consolidation Consolidation, Policy [Policy Text Block] Risks and Uncertainties Risks and Uncertainties Policy [Policy Text Block] Risks and Uncertainties Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Change in a Plan to Sell Change in a Plan to Sell Policy [Policy Text Block] Change in a Plan to Sell Policy [Policy Text Block] Real Estate Held for Non-Sale Disposition Real Estate Held for Non-Sale Disposition Policy [Policy Text Block] Real Estate Held for Non-Sale Disposition Policy [Policy Text Block] Per Share Data Earnings Per Share, Policy [Policy Text Block] Segments Segment Reporting, Policy [Policy Text Block] REAL ESTATE SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] October 1, 2012 through December 31, 2012 Operating Leases, Future Minimum Payments Receivable, Current 2013 Operating Leases, Future Minimum Payments Receivable, in Two Years 2014 Operating Leases, Future Minimum Payments Receivable, in Three Years 2015 Operating Leases, Future Minimum Payments Receivable, in Four Years 2016 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Future minimum rental income Operating Leases, Future Minimum Payments Receivable Office Portfolio Mortgage Loan [Member] Office Portfolio Mortgage Loan [Member] Office Portfolio Mortgage Loan [Member] Industrial Portfolio Mortgage Loan [Member] Industrial Portfolio Mortgage Loan [Member] Industrial Portfolio Mortgage Loan [Member] Rivertech Mortgage Loan [Member] Rivertech Mortgage Loan [Member] Rivertech Mortgage Loan [Member] Rickenbacker Mortgage Loan [Member] Rickenbacker Mortgage Loan [Member] Rickenbacker Mortgage Loan [Member] Mortgage loan, disbursed to company Mortgage Loan, Disbursed to Company Mortgage Loan, Disbursed to Company Mortgage loan, available for future disbursements Mortgage Loan, Available for Future Disbursements Mortgage Loan, Available for Future Disbursements Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Amortization schedule Amortization Schedule of Mortgage Loans on Real Estate Amortization schedule of mortgage loans on real estate. Payment terms Debt Instrument, Payment Terms Guaranty provided as a percent of outstanding loan amount Guaranty Provided As Percent, Outstanding Loan Amount Guaranty Provided As Percent, Outstanding Loan Amount Petra Subordinated Debt [Member] Petra Subordinated Debt [Member] Petra Subordinated Debt [Member] Real Estate Loans Receivable [Roll Forward] Real Estate Loans Receivable [Roll Forward] Real Estate Loans Receivable [Roll Forward] Real estate loans receivables, Beginning Balance Principal repayments received on real estate loan receivable Proceeds from Principal Repayments on Loans and Leases Held-for-investment Extension fees related to real estate loans receivable Accretion of discounts on purchased real estate loans receivable Accretion of Discounts on Purchased Real Estate Loans Receivable Accretion of discounts on purchased real estate loans receivable. Amortization of origination fees and costs on purchased and originated real estate loans receivable Change in loan loss reserve Sale of loan Mortgage Loans on Real Estate, Commercial and Consumer, Sale Mortgage loans on real estate, commercial and consumer, sale. Write-off of debt Mortgage Loans on Real Estate, Commercial and Consumer, Write-Off Amount Mortgage loans on real estate, commercial and consumer, write-off amount. Real estate loans receivables, Ending Balance Deferred financing costs Deferred Finance Costs, Noncurrent, Net Amortization of financing cost, net of discontinued operations Amortization of Financing Cost, Net of Discontinued Operations Amortization of financing cost, net of discontinued operations. Amortization of discount on notes payable, net Interest payable Interest Payable Directly or indirectly owned properties Number of Real Estate Properties, Directly or Indirectly Owned Number of Real Estate Properties, Directly or Indirectly Owned Minimum amount from sale or refinancing of properties Minimum Amount from Sale or Refinancing of Real Estate Properties Minimum Amount from Sale or Refinancing of Real Estate Properties Monthly amortization payments from October 1, 2012 Monthly Amortization Payments Amount Monthly amortization payments amount. Monthly amortization payment if sales agreement is terminated Monthly Amortization Payment if Sales Agreement is Terminated Monthly Amortization Payment if Sales Agreement is Terminated Deposit Deposit Assets Deposit, released Deposit Asset, Released Deposit Asset, Released Schedule of Face Value, Carrying Amounts and Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Assets and Liabilities at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of Estimated Capitalization Rates Schedule of Estimated Capitalization Rates [Table Text Block] Schedule of Estimated Capitalization Rates [Table Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Basis [Member] Fair Value, Measurements, Recurring [Member] Nonrecurring Basis [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Real Estate, Operating Activities [Axis] Real Estate, Operating Activities [Axis] Real Estate, Operating Activities [Axis] Real Estate, Operating Activities [Domain] Real Estate, Operating Activities [Domain] Real Estate, Operating Activities [Domain] Segment, Continuing Operations [Member] Segment, Continuing Operations [Member] Segment, Discontinued Operations [Member] Segment, Discontinued Operations [Member] Liability derivatives Contingent liability Contingent Consideration Related to Acquisition of Real Estate Contingent consideration related to acquisition of real estate. Total real estate, at cost and net of impairment charges Real Estate Held-for-Sale, at Cost Real estate held for sale, at cost. Accumulated depreciation and amortization Real Estate Held-for-Sale, Accumulated Depreciation Real estate held for sale, accumulated depreciation. Real estate held for sale, net Other assets Total assets Real Estate Held-for-Sale, Total Real estate held-for-sale, total amount. Notes payable Other liabilities Total liabilities Liabilities Related to Real Estate Held-for-Sale, Total Liabilities related to real estate held-for-sale, total amount. Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] NORTH CAROLINA NORTH CAROLINA Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Assets, Total [Member] Assets, Total [Member] Concentration risk, percentage Rentable square feet Area of Real Estate Property Percentage of real estate portfolio occupied Percentage of Real Estate Portfolio Occupied Percentage of real estate portfolio occupied. Tenant Lease - Bank of America, N.A. [Member] Tenant Lease - Bank of America, N.A. [Member] Tenant Lease - Bank of America, N.A. [Member] Tenant Lease - Wells Fargo Bank, N.A. [Member] Tenant Lease - Wells Fargo Bank, N.A. [Member] Tenant Lease - Wells Fargo Bank, N.A. [Member] Rentable Square Feet [Member] Rentable Square Feet [Member] Rentable Square Feet [Member] Base Rent [Member] Base Rent [Member] Base Rent [Member] Rentable Square Feet Annualized Base Rent per Square Foot Average Annualized Base Rent Per Square Foot Average annualized base rent per square foot. October 1, 2012 through December 31, 2012 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2013 Long-term Debt, Maturities, Repayments of Principal in Year Two 2014 Long-term Debt, Maturities, Repayments of Principal in Year Three 2015 Long-term Debt, Maturities, Repayments of Principal in Year Four 2016 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term debt, gross Long-term Debt, Gross Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Organizational Structure [Table] Schedule of Organizational Structure [Table] Schedule of Organizational Structure [Table] KBS Capital Advisors LLC [Member] KBS Capital Advisors LLC [Member] KBS Capital Advisors LLC [Member] Organizational Structure [Line Items] Organizational Structure [Line Items] Organizational Structure [Line Items] Partnership interest in the Operating Partnership and is its sole limited partner Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Partnership interest in Operating Partnership Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Number of real estate properties held for non-sale disposition Number of Real Estate Properties Held for Non-Sale Disposition Number of real estate properties held for non-sale disposition. Number of real estate loans receivable Number of Real Estate Loans and Leases Receivable Number of real estate loans and leases receivable. Shares held by affiliate Shares held by affiliate Shares held by affiliate Shares of common stock sold under dividend reinvestment plan, shares Stock Issued During Period, Shares, Dividend Reinvestment Plan Shares of common stock sold under dividend reinvestment plan, value Stock Issued During Period, Value, Dividend Reinvestment Plan Redemptions of common stock, shares Redemptions of common stock, value Agreement for annual fee to be paid for real estate services, amount Agreement for Annual Fee to be Paid for Real Estate Services, Amount Agreement for annual fee to be paid for real estate services, amount. Net sales value of properties sold and remaining net assets in excess of threshold amounts Net Sales Value of Properties Sold and Remaining Net Assets in Excess of Threshold Amounts Net sales value of properties sold and remaining net assets in excess of threshold amounts. Amended services agreement, annual fee Amended Services Agreement, Reduction in Annual Fee Amended Services Agreement, Reduction in Annual Fee Agreement termination fee Agreement Termination Fee Agreement Termination Fee Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Buildings and Improvements [Member] Building and Building Improvements [Member] Tenant Origination and Absorption Costs [Member] Tenant Origination and Absorption Costs [Member] Tenant Origination and Absorption Costs [Member] Office [Member] Office [Member] Office [Member] Industrial [Member] Industrial [Member] Industrial [Member] Real estate held for investment, at cost and net of impairment charges SUPPLEMENTAL CASH FLOW AND SIGNIFICANT NONCASH TRANSACTION DISCLOSURES Cash Flow, Supplemental Disclosures [Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block]