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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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Transfers and Servicing [Abstract]      
Proceeds received from securitizations $ 3,256,625 $ 5,197,071 $ 4,970,454
Servicing fees collected 41,509 14,616 29,239
Purchases of previously transferred assets, net of claims reimbursed (5,948) (1,271) (2,863)
Cash flows between transferor and transferee proceeds and payment related to transfers accounted for sales $ 3,292,186 $ 5,210,416 $ 4,996,830