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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Dec. 31, 2013
Line of Credit [Member]
Wells Fargo [Member]
Dec. 31, 2012
Line of Credit [Member]
Wells Fargo [Member]
Dec. 22, 2011
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Feb. 28, 2013
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Aug. 31, 2010
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Dec. 31, 2012
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Collateral Pledged Type One [Member]
Dec. 31, 2012
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Collateral Pledged Type Two [Member]
Dec. 31, 2012
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Collateral Pledged Type Three [Member]
Dec. 31, 2012
Line of Credit [Member]
Wells Fargo [Member]
One Month LIBOR [Member]
Collateral Pledged Type Four [Member]
Sep. 30, 2013
Line of Credit [Member]
UBS [Member]
Dec. 31, 2013
Line of Credit [Member]
UBS [Member]
Dec. 31, 2012
Line of Credit [Member]
UBS [Member]
Dec. 31, 2013
Line of Credit [Member]
JP Morgan Chase [Member]
Dec. 31, 2012
Line of Credit [Member]
JP Morgan Chase [Member]
Feb. 28, 2013
Line of Credit [Member]
JP Morgan Chase [Member]
One Month LIBOR [Member]
Apr. 30, 2012
Line of Credit [Member]
JP Morgan Chase [Member]
One Month LIBOR [Member]
Jan. 31, 2010
Line of Credit [Member]
JP Morgan Chase [Member]
One Month LIBOR [Member]
Dec. 31, 2013
Line of Credit [Member]
JP Morgan Chase [Member]
One Month LIBOR [Member]
Debt Instrument [Line Items]                                            
Debt Balance $ 202,033 $ 225,158 $ 202,033 $ 225,158 $ 47,751 $ 225,155                 $ 133,899 $ 0 $ 20,383 $ 3        
Weighted Average Remaining Maturity     3 years 3 months 12 days 1 year 1 month 6 days 2 months 12 days 1 year 1 month 6 days [1]               4 years 4 years 8 months 12 days [1]   1 year 1 month 6 days [1] 5 days        
Weighted Average Rate     2.40% 1.80% 1.20% 1.80% [2]                 2.80%   2.70% 2.70%        
Basis point             1.50% 1.05% 1.25% 1.05% 1.25% 1.50% 2.35%           2.50% 2.50% 3.00% 2.50%
[1] Assumes extension options are exercised.
[2] Borrowings outstanding under the Wells Facility bear interest at a LIBOR plus 105, 125 basis points, 150 basis points or 235 basis points depending on the collateral pledged.