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Securitizations and Variable Interests Entities - Summary of Cash Flows Received from and Paid to Securitization Trusts Related to Transfers Accounted for as Sales Outstanding (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Transfers and Servicing [Abstract]            
Proceeds received from securitizations $ 1,478,142 $ 1,369,468 $ 3,964,866 $ 4,346,991 $ 5,265,183 $ 7,871,481
Servicing fees collected 5,973 10,840 25,066 25,174 25,438 20,333
Purchases of previously transferred assets, net of claims reimbursed 1,512 2,237 2,408 2,237 4,973 (358)
Cash flows received from and paid to securitization trusts, total         $ 5,295,594 $ 7,891,456
Cash Flows Between Transferor And Transferee Proceeds And Payment Related To Transfers Accounted For Sales $ 1,485,627 $ 1,382,545 $ 3,992,340 $ 4,374,402