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Income Tax - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax Act adjustments | $ (1,750) | $ (25,992) | $ 0 |  |
Deferred income taxes |  |  |  |  | $ 46,879
Loss and credit carryforwards |  |  |  | $ 17,999 | 0
Uncertain tax position | 0 | 0 |  | $ 1,929 | 0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Increases for tax positions related to prior years | 1,929 |  |  |  |
Balance at end of year | 1,929 | 0 |  |  |
Income taxes, net of refunds | $ 6,800 | $ 36,000 | $ 30,200 |  |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred income taxes |  |  |  |  | $ 7,965

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