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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 27.20% | 17.30% | 25.30% | 17.20% |
Accrued interest on unrecognized tax benefits | $ 560 |  | $ 560 |  | $ 568
Gross unrecognized tax benefits excluding interest and penalties | 40,766 |  | 40,766 |  | $ 32,684
Net unrecognized tax benefits excluding interest and penalties | $ 33,069 |  | 33,069 |  |
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions |  |  | 1,175 |  |
Income Tax Reconciliation Nondeductible Expense Executive Compensation |  |  | $ 5,023 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 9.80% |  | 7.50% |  |

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