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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
 6 Months Ended
Jun. 30, 2017
USD ($)
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 $ 1,340,254
JPMorgan Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 794,404
Maximum Month-End Balance 894,031
Average Month-End Balance 832,685
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 263,980
Maximum Month-End Balance 367,010
Average Month-End Balance 297,148
Goldman Loan [Member]  
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 37,700
Maximum Month-End Balance 39,590
Average Month-End Balance 38,707
UBS Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 100,798
Maximum Month-End Balance 133,899
Average Month-End Balance 111,832
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at June 30, 2017 143,372
Maximum Month-End Balance 177,203
Average Month-End Balance $ 149,453