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Fair Value Disclosure (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments $ 1,933 $ 0
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 17,919 33,362
Derivative instruments 1,933  
Total Fair Value 519,553 191,448
Level 2 [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 499,701 158,086
Estimated Fair Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 17,919 33,362
Derivative instruments 1,933  
Total Fair Value 519,553 191,448
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 $ 499,701 $ 158,086