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Goodwill and Intangibles - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2018 USD ($) Acquisition | Sep. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Number of immaterial acquisitions | Acquisition | 1 |
Goodwill impairment | $ 0 | $ 0
Increase in gross carrying amount of intangibles | $ 21,400,000 |

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