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Investments in Real Estate - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 09, 2017
USD ($)
Property
Oct. 31, 2017
USD ($)
Property
Sep. 30, 2017
USD ($)
Property
Sep. 30, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]          
Investments in real estate, net, Book Value [1]     $ 368,700 $ 368,700 $ 716,432
Investments in real estate     399,674 $ 399,674 854,646
Number of retail property disposed | Property       1  
Number of parcel land disposed | Property       1  
Number of real estate properties parcels sold | Property       2  
Number of real estate properties separate transactions | Property       2  
Gains (losses) on deconsolidation of properties     (4,035) $ (19,982)  
Non-cash impairment charges on real estate assets     3,121 91,989  
New Investment Approach          
Real Estate Properties [Line Items]          
Investments in real estate     107,217 107,217  
Non-cash impairment charges on real estate assets     3,006 74,514  
Investments in real estate, gross     110,223 $ 110,223  
Non Recourse Indebtedness          
Real Estate Properties [Line Items]          
Number of mortgage liens properties | Property       8  
Non Recourse Indebtedness | Loan Payable On Real Estate          
Real Estate Properties [Line Items]          
Number of real estate properties disposed | Property       3  
Prior June 30, 2017 Disposal Group Held For Sale Or Disposed Of By Sale Not Discontinued Operations          
Real Estate Properties [Line Items]          
Gain (loss) on sale       $ (20)  
Multifamily properties          
Real Estate Properties [Line Items]          
Investments in real estate     17,118 $ 17,118 147,201
Number of real estate properties disposed | Property       5  
Carrying value of asset held for sale         62,428
Multifamily properties | Sale of property occurred during second quarter of 2015          
Real Estate Properties [Line Items]          
Gain (loss) on sale       $ 3,122  
Office          
Real Estate Properties [Line Items]          
Investments in real estate     217,152 $ 217,152 397,769
Number of real estate properties disposed | Property       5  
Carrying value of asset held for sale     47,990 $ 47,990  
Office | Subsequent Event          
Real Estate Properties [Line Items]          
Number of real estate properties disposed | Property   1      
Gain (loss) on sale   $ 191      
Disposal of real estate properties   $ 53,150      
Land Parcel          
Real Estate Properties [Line Items]          
Investments in real estate     35,406 35,406 52,234
Carrying value of asset held for sale     14,839 14,839 14,233
Land Parcel | Subsequent Event          
Real Estate Properties [Line Items]          
Number of real estate properties disposed | Property   2      
Gain (loss) on sale   $ 701      
Disposal of real estate properties   $ 12,125      
Industrial real estate properties          
Real Estate Properties [Line Items]          
Investments in real estate     14,816 14,816 93,423
Gains (losses) on deconsolidation of properties     (4,713) $ (20,660)  
Number of industrial real estate properties deconsolidated | Property       10  
Deconsolidation of properties, carrying value         82,501
Cross-collateralized non-recourse debt related to deconsolidation of property         81,941
Industrial real estate properties | Non Recourse Indebtedness | Loan Payable On Real Estate          
Real Estate Properties [Line Items]          
Gains (losses) on deconsolidation of properties     $ (4,713) $ 20,660  
Number of industrial real estate properties deconsolidated | Property     10 10  
Deconsolidation of properties, carrying value     $ 13,909 $ 13,909 82,501
Cross-collateralized non-recourse debt related to deconsolidation of property     $ 34,874 $ 34,874  
Number of mortgage liens properties | Property     3 8  
Remaining number of industrial real estate properties | Property     2 2  
Industrial real estate properties | Subsequent Event          
Real Estate Properties [Line Items]          
Number of mortgage liens properties | Property 10        
Carrying value of asset held for sale $ 9,039        
Remaining number of mortgage liens properties | Property 1        
Three Industrial Real Estate Properties | Non Recourse Indebtedness | Loan Payable On Real Estate          
Real Estate Properties [Line Items]          
Carrying value of asset held for sale     $ 24,313 $ 24,313  
Extinguishment of debt       19,600  
Eight Industrial Real Estate Properties | Non Recourse Indebtedness | Loan Payable On Real Estate          
Real Estate Properties [Line Items]          
Carrying value of asset held for sale     67,726 67,726  
Extinguishment of debt       47,067  
Real Estate Portfolio And Industrial Properties | Non Recourse Indebtedness | Loan Payable On Real Estate          
Real Estate Properties [Line Items]          
Gains (losses) on deconsolidation of properties     $ 678 $ 678  
Number of industrial real estate properties deconsolidated | Property     2 2  
Deconsolidation of properties, carrying value     $ 16,216 $ 16,216 17,698
Number of mortgage liens properties | Property     4 4  
Carrying value of asset held for sale     $ 17,045 $ 17,045  
Extinguishment of debt       $ 17,723  
Number of real estate portfolio properties deconsolidation | Property     2 2  
One Real Estate Property | New Investment Approach          
Real Estate Properties [Line Items]          
Non-cash impairment charges on real estate assets     $ 115    
Four Real Estate Properties          
Real Estate Properties [Line Items]          
Investments in real estate     102,155 $ 102,155  
Non-cash impairment charges on real estate assets       50,274  
One Office Property          
Real Estate Properties [Line Items]          
Investments in real estate     39,218 39,218  
Non-cash impairment charges on real estate assets       17,447  
One Retail Property          
Real Estate Properties [Line Items]          
Investments in real estate     30,863 30,863  
Non-cash impairment charges on real estate assets       6,793  
Eight Other Real Estate Properties          
Real Estate Properties [Line Items]          
Non-cash impairment charges on real estate assets       14,354  
Commercial Loan          
Real Estate Properties [Line Items]          
Carrying Value, Transfer of commercial mortgage loan to real estate owned       1,590  
Consolidation Eliminations          
Real Estate Properties [Line Items]          
Investments in real estate     399,674 399,674 854,646
Mortgages loans or other debt held by third parties     97,492 97,492 186,237
Mortgages loans held by consolidated securitizations     455,820 455,820 642,824
Land          
Real Estate Properties [Line Items]          
Investments in real estate, net, Book Value     104,053 104,053 169,133
Building and Building Improvements          
Real Estate Properties [Line Items]          
Investments in real estate, net, Book Value     $ 295,621 $ 295,621 $ 685,513
[1] As of September 30, 2017, one of our office properties, with a carrying amount of $47,990, and two of our parcels of land, with a carrying amount of $14,839, were considered held-for-sale. As of December 31, 2016, three of our multifamily properties, with a carrying amount of $62,428, and two of our parcels of land, with a carrying amount of $14,233, were considered held-for-sale.