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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to 2017 Tax Act |  |  |  |  |  |  |  |  | $ (44,900) |  |
Reduction to income tax expense 2017 Tax Act |  |  |  |  |  |  |  |  | 65,100 |  |
Provisional transition tax expense |  |  |  |  |  |  |  |  | 18,700 |  |
Transition tax payment next twelve months | $ 2,500 |  |  |  |  |  |  |  | 2,500 |  |
Valuation allowance | 21,621 |  |  |  | $ 18,900 |  |  |  | 21,621 | $ 18,900 |
Deferred tax liability not recognized related to tax basis difference in investment in foreign subsidiaries | 13,400 |  |  |  |  |  |  |  | 13,400 |  |
Income tax provision (benefit) | (38,458) | $ 9,197 | $ 527 | $ 7,877 | (1,832) | $ 10,292 | $ 15,437 | $ 18,386 | (20,857) | 42,283 | $ 39,333
Liability for uncertain tax positions | $ 2,700 |  |  |  | $ 2,700 |  |  |  | $ 2,700 | $ 2,700 |
Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforward period |  |  |  |  |  |  |  |  | 20 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforward period |  |  |  |  |  |  |  |  | indefinite |  |

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