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Summarizes Levels in Fair Value Hierarchy of Financial Instruments (Detail) (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]    
CMBS and Interest rate, Total $ 278,733 $ 553,517
AAA-rated CMBS (Available-for-Sale) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 67,079 302,543
AAA-rated CMBS (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 138,248 251,452
CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 73,561  
Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total (156) (666)
Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 1 188
Level 2 [Mermber]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 278,733 553,517
Level 2 [Mermber] | AAA-rated CMBS (Available-for-Sale) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 67,079 302,543
Level 2 [Mermber] | AAA-rated CMBS (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 138,248 251,452
Level 2 [Mermber] | CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 73,561  
Level 2 [Mermber] | Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total (156) (666)
Level 2 [Mermber] | Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total $ 1 $ 188