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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
Sep. 30, 2017
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 315,590
1 to 3 years 973,925
3 to 5 years 0
More than 5 years 0
Total 1,289,515
JPMorgan Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 166,273
1 to 3 years 674,087
3 to 5 years 0
More than 5 years 0
Total 840,360
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 265,658
3 to 5 years 0
More than 5 years 0
Total 265,658
Goldman Loan [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 34,180
3 to 5 years 0
More than 5 years 0
Total 34,180
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 149,317
1 to 3 years 0
3 to 5 years 0
More than 5 years 0
Total $ 149,317