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Borrowings Under Repurchase Agreements - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 $ 1,021,037
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 648,086
Maximum Month-End Balance 800,917
Average Month-End Balance 675,061
Deutsche Bank Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 0
Maximum Month-End Balance 0
Average Month-End Balance 0
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 42,796
Maximum Month-End Balance 45,928
Average Month-End Balance 44,105
UBS [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 133,899
Maximum Month-End Balance 133,899
Average Month-End Balance 133,899
Deutsche Bank [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2016 196,256
Maximum Month-End Balance 300,005
Average Month-End Balance $ 266,056