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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |
Provision for income taxes (benefit) expense related to remeasurement of net deferred tax liability | $ (28,400) |  | $ (28,400) |  |
U.S. statutory federal income tax rate |  |  | 35.00% | 35.00% | 35.00%
Net long-term deferred tax asset | 2,900 |  | $ 2,900 | $ 2,400 |
Net long-term deferred tax liability | 51,619 |  | 51,619 | 76,447 |
Gross deferred tax assets related to state net operating loss carryforwards | 282,000 |  | 282,000 |  |
Valuation allowance related to certain state net operating loss carryforward deferred tax assets | 8,000 |  | 8,000 |  |
Liabilities recorded related to unrecognized tax benefits |  |  |  | 5,200 |
Liabilities related to interest and penalties | 600 |  | 600 | 800 |
Unrecognized tax benefit that would affect income tax rate if recognized | $ 4,700 |  | $ 4,700 | $ 3,300 |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss expiration date |  |  | Net operating loss carryforwards that will expire between 2018 and 2037 |  |
Operating loss expiration, beginning year |  |  | 2018 |  |
Operating loss expiration, ending year |  |  | 2037 |  |
State and Local Jurisdiction [Member] | Tax Year 2017 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination year |  |  | 2017 |  |
State and Local Jurisdiction [Member] | Tax Year 2013 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination year |  |  | 2013 |  |
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2014 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination year |  |  | 2014 |  |
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2017 [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax examination year |  |  | 2017 |  |
Scenario, Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. statutory federal income tax rate |  | 21.00% |  |  |

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