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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
Jun. 30, 2017
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 638,531
1 to 3 years 701,723
3 to 5 years 0
More than 5 years 0
Total 1,340,254
JPMorgan Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 436,546
1 to 3 years 357,858
3 to 5 years 0
More than 5 years 0
Total 794,404
DB Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 58,613
1 to 3 years 205,367
3 to 5 years 0
More than 5 years 0
Total 263,980
Goldman Loan [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 37,700
3 to 5 years 0
More than 5 years 0
Total 37,700
UBS Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 100,798
3 to 5 years 0
More than 5 years 0
Total 100,798
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 143,372
1 to 3 years 0
3 to 5 years 0
More than 5 years 0
Total $ 143,372