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Borrowings Under Repurchase Agreements - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding $ 1,091,316  
Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 1,091,316 $ 925,774
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  
DB Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 276,868 300,005
Maximum Month-End Balance 300,005  
Average Month-End Balance 290,076  
JP Morgan Chase [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 635,676 445,942
Maximum Month-End Balance 635,676  
Average Month-End Balance 556,124  
Goldman Sachs [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, amount outstanding 44,873 $ 45,928
Maximum Month-End Balance 45,928  
Average Month-End Balance $ 45,665