XML 63 R53.htm IDEA: XBRL DOCUMENT v3.7.0.1
Borrowings Under Repurchase Agreements - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Detail) - Line of Credit [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 $ 1,487,235
JP Morgan Chase [Member]  
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 894,031
Maximum Month-End Balance 894,031
Average Month-End Balance 767,774
Deutsche Bank Repurchase Facility [Member]  
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 308,730
Maximum Month-End Balance 308,730
Average Month-End Balance 223,012
Goldman Sachs [Member]  
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 39,001
Maximum Month-End Balance 40,657
Average Month-End Balance 39,976
UBS [Member]  
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 100,798
Maximum Month-End Balance 133,899
Average Month-End Balance 125,623
Deutsche Bank [Member]  
Line of Credit Facility [Line Items]  
Balance at March 31, 2017 144,675
Maximum Month-End Balance 157,500
Average Month-End Balance $ 149,257