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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Tax Cuts and Jobs Act incomplete accounting transition tax unrepatriated earnings foreign subsidiaries payable period |  |  |  |  | 8 years
U.S. federal statutory tax rate |  |  | 21.00% |  | 35.00%
Effective income tax rate | 27.00% | 34.00% | 27.00% | 32.00% |
Unrecognized tax benefits | $ 0 |  | $ 0 |  |
Unrecognized tax benefits recorded during period |  |  | $ 0 |  |

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