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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding $ 202,033 $ 225,158
Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 202,033 225,158
Wells Fargo [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 47,751 225,155
Maximum Month-End Balance 225,156 469,147
Average Month-End Balance 168,747 283,100
UBS [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 133,899 0
Maximum Month-End Balance 133,899 0
Average Month-End Balance 31,728 0
JP Morgan Chase [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 20,383 3
Maximum Month-End Balance 20,383 68,720
Average Month-End Balance $ 3,138 $ 37,461