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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, 2017
USD ($)
Line of Credit Facility [Line Items]  
Balance at September 30, 2017 $ 1,289,515
JPMorgan Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2017 840,360
Maximum Month-End Balance 986,611
Average Month-End Balance 849,355
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2017 265,658
Maximum Month-End Balance 367,010
Average Month-End Balance 286,326
Goldman Loan [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2017 34,180
Maximum Month-End Balance 39,590
Average Month-End Balance 37,554
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at September 30, 2017 149,317
Maximum Month-End Balance 177,203
Average Month-End Balance $ 136,930