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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Total $ 115,375
Line of Credit [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 238,658
1 to 3 years 822,935
3 to 5 years 29,723
More than 5 years 0
Total 1,091,316
Line of Credit [Member] | 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
Line of Credit [Member] | DB Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 74,819
1 to 3 years 202,049
3 to 5 years 0
More than 5 years 0
Total 276,868
Line of Credit [Member] | JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 154,266
1 to 3 years 481,410
3 to 5 years 0
More than 5 years 0
Total 635,676
Line of Credit [Member] | Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 4,569
1 to 3 years 10,581
3 to 5 years 29,723
More than 5 years 0
Total $ 44,873