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Amortized Cost and Estimated Fair Value (Detail) (Debt Securities [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount $ 273,343 $ 546,807
Amortized cost 273,713 554,716
Gross Unrealized Gain 5,621 810
Gross Unrealized Loss (446) (1,531)
Estimated Fair Value 278,888 553,995
AAA-rated CMBS (Available-for-Sale) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 65,410 298,598
Amortized cost 67,109 301,980
Gross Unrealized Gain 249 810
Gross Unrealized Loss (279) (247)
Estimated Fair Value 67,079 302,543
AAA-rated CMBS (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 134,694 248,209
Amortized cost 136,354 252,736
Gross Unrealized Gain 2,061  
Gross Unrealized Loss (167) (1,284)
Estimated Fair Value 138,248 251,452
CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 73,239  
Amortized cost 70,250  
Gross Unrealized Gain 3,311  
Estimated Fair Value $ 73,561