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Income Taxes - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate | 43.90% | 37.90% | 15.20% | 37.50%
Maximum measurement period to complete accounting for tax law changes |  |  | 1 year |

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