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Weighted Average Maturities and Interest Rates of Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Debt Balance $ 225,158 $ 542,027
Weighted Average Remaining Maturity 1 year 1 month 6 days 1 year 3 months 18 days
Weighted Average Rate 1.80% 2.30%
Wells Facility borrowings [Member]
   
Debt Instrument [Line Items]    
Debt Balance 225,155 221,980
Weighted Average Remaining Maturity 1 year 1 month 6 days 1 year 7 months 6 days
Weighted Average Rate 1.80% 1.50%
JPMorgan Facility borrowings [Member]
   
Debt Instrument [Line Items]    
Debt Balance 3 68,720
Weighted Average Remaining Maturity 5 days 10 months 24 days
Weighted Average Rate 2.70% 3.30%
TALF borrowings [Member]
   
Debt Instrument [Line Items]    
Debt Balance    $ 251,327
Weighted Average Remaining Maturity    1 year 3 months 18 days
Weighted Average Rate    2.80%