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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
Sep. 30, 2015
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 67,859
1 to 3 years 633,233
3 to 5 years 34,345
More than 5 years 0
Total 735,437
UBS [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 5,004
1 to 3 years 128,895
3 to 5 years 0
More than 5 years 0
Total 133,899
DB Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 58,552
1 to 3 years 241,453
3 to 5 years 0
More than 5 years 0
Total 300,005
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 1,177
1 to 3 years $ 252,304
3 to 5 years
More than 5 years
Total $ 253,481
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 3,126
1 to 3 years 10,581
3 to 5 years $ 34,345
More than 5 years
Total $ 48,052