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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (Debt Securities [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount $ 258,369 $ 273,343
Amortized Cost 258,736 273,713
Gross Unrealized Gain 4,627 5,621
Gross Unrealized Loss (690) (446)
Estimated Fair Value 262,673 278,888
AAA-rated CMBS (Available-for-Sale) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 62,866 65,410
Amortized Cost 64,404 67,109
Gross Unrealized Gain 188 249
Gross Unrealized Loss (376) (279)
Estimated Fair Value 64,216 67,079
AAA-rated CMBS (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 123,108 134,694
Amortized Cost 124,420 136,354
Gross Unrealized Gain 1,232 2,061
Gross Unrealized Loss (314) (167)
Estimated Fair Value 125,338 138,248
CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Face Amount 72,395 73,239
Amortized Cost 69,912 70,250
Gross Unrealized Gain 3,207 3,311
Gross Unrealized Loss      
Estimated Fair Value $ 73,119 $ 73,561