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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
Sep. 30, 2016
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 319,282
1 to 3 years 680,402
3 to 5 years 8,643
More than 5 years 12,710
Total 1,021,037
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 313,547
1 to 3 years 334,539
3 to 5 years 0
More than 5 years 0
Total 648,086
Deutsche Bank Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 0
3 to 5 years 0
More than 5 years 0
Total 0
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 5,290
1 to 3 years 37,506
3 to 5 years 0
More than 5 years 0
Total 42,796
UBS [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 260
1 to 3 years 133,639
3 to 5 years 0
More than 5 years 0
Total 133,899
Deutsche Bank [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 185
1 to 3 years 174,718
3 to 5 years 8,643
More than 5 years 12,710
Total $ 196,256