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Fair Value Disclosure - Summary of Level 3 Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 180,156 $ 336,982
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments, net (11,746) 5,906
Estimated Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 191,902 331,076
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 0 0
Level 1 [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments, net 0 0
Level 1 [Member] | Estimated Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 0 0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total (11,746) 336,982
Level 2 [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments, net (11,746) 5,906
Level 2 [Member] | Estimated Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 0 331,076
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 191,902 0
Level 3 [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments, net 0 0
Level 3 [Member] | Estimated Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS $ 191,902 $ 0