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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Effective tax rate | 14.40% |  | 18.50% |  | 20.40% | 17.60% |
Accrued interest on unrecognized tax benefits | $ 581 |  |  |  | $ 581 |  | $ 568
Gross unrecognized tax benefits excluding interest and penalties | 41,170 |  |  |  | 41,170 |  | $ 32,684
Net unrecognized tax benefits excluding interest and penalties | $ 33,415 |  |  |  | 33,415 |  |
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions |  |  |  |  | 1,225 |  |
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% | 3.80% |  |

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