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Significant Accounting Policies - Additional Information (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | Jan. 01, 2020 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) numberOfInvestments | Sep. 30, 2019 USD ($) | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Percentage of Private Education Loans related to borrowers in school, grace or deferment |  |  | 27.00% |  | 27.00% |  | 25.00%
Interest rate offered to borrowers facing financial difficulty |  |  | 4.00% |  | 4.00% |  |
Period of forbearance period to be classified as TDR |  |  |  |  | 3 months |  |
Period of forbearance |  |  |  |  | 24 months |  |
Period after grace period for forbearance allowance for loans |  |  |  |  | 9 months |  |
Forbearance period after grace period for loans |  |  |  |  | 6 months |  |
Percentage of loans granted forbearance (as a percentage) |  |  | 47.00% |  | 47.00% |  | 50.00%
Percentage reimbursement on all qualifying default claims period two (as a percentage) |  |  | 97.00% |  | 97.00% |  |
Percentage reimbursement on all qualifying default claims period one (as a percentage) |  |  | 98.00% |  | 98.00% |  |
Percentage reimbursement on all qualifying default claims period three (as a percentage) |  |  | 100.00% |  | 100.00% |  |
Variable rate |  |  | 105.00% |  | 105.00% |  |
Gain on sale of Upromise subsidiary | $ 11,000 |  |  |  | $ 11,331 | $ 0 |
Restructuring expenses |  |  | $ 24,127 | $ 0 | $ 24,127 | $ 0 |
Restructuring expenses related to severance benefits |  |  | 20,000 |  |  |  |
Other related costs |  |  | $ 4,000 |  |  |  |
Positions eliminated | numberOfInvestments |  |  |  |  | 165 |  |
Workforce eliminated |  |  |  |  | 9.00% |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
Period of deferment |  | 2 |  |  |  |  |

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