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Fair Value Disclosure - Summarizes Levels in Fair Value Hierarchy of Financial Instruments (Detail) (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]    
CMBS and Interest rate, Total $ 262,590 $ 278,733
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 64,216 67,079
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 125,338 138,248
CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 73,119 73,561
Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total (84) (156)
Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 1 1
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 1 [Member] | 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      
Level 1 [Member] | 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      
Level 1 [Member] | CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 1 [Member] | Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 1 [Member] | Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 262,590 278,733
Level 2 [Member] | 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 64,216 67,079
Level 2 [Member] | 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 125,338 138,248
Level 2 [Member] | CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 73,119 73,561
Level 2 [Member] | Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total (84) (156)
Level 2 [Member] | Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total 1 1
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 3 [Member] | 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      
Level 3 [Member] | 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      
Level 3 [Member] | CMBS - Hilton (Fair Value Option) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 3 [Member] | Interest rate swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total      
Level 3 [Member] | Interest rate caps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CMBS and Interest rate, Total