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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2018
Income Taxes [Line Items] |  |  |  |
Provision for income taxes benefit (expense) related to remeasurement of net deferred tax liability | $ (28,400) | $ 28,400 |  |
Net long-term deferred tax asset | 2,900 | 2,900 | $ 3,700 |
Net long-term deferred tax liability | 51,619 | 51,619 | 33,178 |
Gross deferred tax assets related to state net operating loss carryforwards |  |  | 277,300 |
Valuation allowance related to certain state net operating loss carryforward deferred tax assets |  |  | 8,100 |
Liabilities recorded related to unrecognized tax benefits |  |  |  | $ 5,300
Liabilities related to interest and penalties |  |  | 600 | $ 600
Unrecognized tax benefit that would affect income tax rate if recognized | $ 4,700 | $ 4,700 | $ 4,900 |

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