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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to 2017 Tax Act |  |  |  |  |  |  |  |  |  | $ (44,900) |
Valuation allowance | $ 21,929 |  |  |  | $ 21,621 |  |  |  | $ 21,929 | 21,621 |
Foreign withholding tax | (413) |  |  |  | (1,035) |  |  |  | (413) | (1,035) |
Deferred tax liability not recognized related to tax basis difference in investment in foreign subsidiaries | 17,800 |  |  |  |  |  |  |  | 17,800 |  |
Income tax provision | 7,834 | $ 19,964 | $ 14,113 | $ 15,270 | (38,458) | $ 9,197 | $ 527 | $ 7,877 | 57,181 | (20,857) | $ 42,283
Liability for uncertain tax positions | $ 3,700 |  |  |  | $ 2,700 |  |  |  | $ 3,700 | $ 2,700 |

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