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Borrowings Under Repurchase Agreements - Remaining Maturities of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
Mar. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Less than 1 year $ 136,879
1 to 3 years 1,350,356
3 to 5 years 0
More than 5 years 0
Total 1,487,235
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 29,251
1 to 3 years 864,780
3 to 5 years 0
More than 5 years 0
Total 894,031
Deutsche Bank Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 0
1 to 3 years 308,730
3 to 5 years 0
More than 5 years 0
Total 308,730
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 5,290
1 to 3 years 33,711
3 to 5 years 0
More than 5 years 0
Total 39,001
UBS [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 100,798
1 to 3 years 0
3 to 5 years 0
More than 5 years 0
Total 100,798
Deutsche Bank [Member]  
Line of Credit Facility [Line Items]  
Less than 1 year 1,540
1 to 3 years 143,135
3 to 5 years 0
More than 5 years 0
Total $ 144,675