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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2014
--- | --- | --- | ---
Deferred tax assets: |  |  |
Loan reserves | $ 62,603 | $ 72,125 |
Stock-based compensation plans | 10,216 | 16,471 |
Deferred revenue | 782 | 793 |
Operating loss carryovers | 4,186 | 8,371 |
Unrealized losses | 0 | 5,364 |
Accrued expenses not currently deductible | 5,356 | 13,605 |
Unrecorded tax benefits | 3,781 | 5,702 |
Other | 2,410 | 10,844 |
Total deferred tax assets | 89,334 | 133,275 |
Deferred tax liabilities: |  |  |
Gains on repurchased debt | 40,175 | 126,403 |
Fixed assets | 5,303 | 6,831 |
Acquired intangible assets | 4,595 | 6,288 |
Unrealized gains | 1,104 | 0 |
Federal deferred for state receivable | 3,584 | 2,058 |
Other | 1,349 | 875 |
Total deferred tax liabilities | 56,110 | 142,455 |
Net deferred tax assets | $ 33,224 |  |
Net deferred tax liabilities |  | $ 9,180 | $ 283,000

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