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Stockholders' Equity - Schedule of Net Transfers To/From Navient Subsidiary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | $ 546,081 | $ 188,792
Dividend | 0 | (120,000)
Corporate push-down | 4,977 | 3,093
Net change in income tax accounts | 15,659 | (134,219)
Net change in receivable/payable | (87,277) | (101,044)
Other | (31) | 0
Total net transfers (to)/from the entity that is now a subsidiary of Navient | 479,409 | (163,378)
Loan origination activities |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | 32,452 | 124,722
Loan sales |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | 45 | 35
Corporate overhead activities |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | 21,216 | 62,031
Special cash contribution |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | 472,718 | 0
Other |  |
Schedule of Transfers To and From Affiliate [Line Items] |  |
Total capital contributions | $ 19,650 | $ 2,004

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