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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill (Gross), beginning balance | $ 243,053
Business Combinations | 1,882
Other | 28
Goodwill (Gross), ending balance | 244,963
Accumulated Impairment Losses, beginning balance | (70,004)
Accumulated Impairment Losses, ending balance | (70,004)
Goodwill (Net), beginning balance | 173,049
Business Combinations | 1,882
Other | 28
Goodwill (Net), ending balance | $ 174,959

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