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Fair Value Disclosure (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS $ 23,281 $ 33,362
Total Fair Value 348,005 191,448
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 324,724 158,086
Estimated Fair Value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Aggregate purchase price of CMBS 23,281 33,362
Total Fair Value 348,005 191,448
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 $ 324,724 $ 158,086