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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill (Gross), beginning balance | $ 225,470
Business Combinations | 11,771
Other | 501
Goodwill (Gross), ending balance | 237,742
Accumulated Impairment Losses, beginning balance | (70,004)
Accumulated Impairment Losses, ending balance | (70,004)
Goodwill (Net), beginning balance | 155,466
Business Combinations | 11,771
Other | 501
Goodwill (Net), ending balance | $ 167,738

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