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Fair Value Disclosure (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 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	$ 25,477	$ 33,362
Fair Value, Net Asset (Liability)	176,611	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	151,134	158,086
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate purchase price of CMBS	25,477	33,362
Fair Value, Net Asset (Liability)	176,611	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	$ 151,134	$ 158,086