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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 12.20% | 25.40% | 18.60% | 26.20% |
Corporate tax rate |  |  | 21.00% |  | 35.00%
Expects repatriate |  |  | $ 100,000,000 |  |
Provisional transition tax obligation | $ 400,000 |  | 19,000,000 |  | $ 19,400,000
Income tax expense | $ 400,000 |  | $ 19,000,000 |  | 19,400,000
Measurement-period adjustment reduction of rate | 0.40% |  | 4.90% |  |
Additional income tax expense | $ 1,900,000 |  |  |  |
Increase in effective tax rate |  |  | 1.80% |  |
Deferred income tax benefit |  |  |  |  | $ 4,500,000
Favorable measurement-period adjustment |  |  | $ 5,200,000 |  |
Tax Cuts And Jobs Act Of 2017 Income Tax Expense Benefit |  |  | $ 9,700,000 |  |
Deduction percent of qualified property |  |  | 100.00% |  |
Additional bonus depreciation |  |  | 20.00% |  |
Addition in valuation allowance | 0 |  | $ 0 |  |
Change in valuation allowance | $ 0 |  | $ 0 |  |

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