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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate | 26.50% | 22.00% |
Favorable basis points on tax rate related to vesting and exercise of stock-based compensation awards, amount |  | $ 2,760,000 |
Favorable basis points on tax rate related to vesting and exercise of stock-based compensation awards |  | 1.00% |
Provision of Tax Cuts and Jobs Act, transition tax on undistributed foreign earnings, unfavorable impact, amount |  | $ 1,664,000 |
Provision of Tax Cuts and Jobs Act, transition tax on undistributed foreign earnings, unfavorable impact basis point on tax rate |  | 0.60% |
Provision of Tax Cuts and Jobs Act, nondeductible portion of transaction costs, unfavorable impact, amount |  | $ 2,369,000 |
Provision of Tax Cuts and Jobs Act, nondeductible portion of transaction costs, unfavorable impact, amount |  | 0.90% |
Federal statutory corporate income tax rate |  | 21.00% | 35.00%

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