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Borrowings Under Repurchase Agreements - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding $ 166,994  
Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 166,994 202,033
Wells Fargo [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 33,092 47,751
Maximum Month-End Balance 47,751  
Average Month-End Balance 38,564  
UBS [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 133,899 133,899
Maximum Month-End Balance 133,899  
Average Month-End Balance 133,899  
JP Morgan Chase [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 3 20,383
Maximum Month-End Balance 32,383  
Average Month-End Balance $ 21,277