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Fair Value Disclosure (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS $ 0 $ 17,105
Derivative assets 246 4,070
Total 512,731 543,905
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 246 4,070
Derivative liabilities 0 0
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 512,485 522,730
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 0 17,105
Total 512,731 543,905
Level 2 [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 246 4,070
Derivative liabilities 0 0
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 $ 512,485 $ 522,730