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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 225,988 | $ 204,558
Accumulated Amortization | 86,279 | 66,567
Net Book Value | 139,709 | 137,991
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 135,900 | 121,015
Accumulated Amortization | 48,668 | 38,651
Net Book Value | 87,232 | 82,364
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,780 | 11,807
Accumulated Amortization | 6,826 | 4,773
Net Book Value | 6,954 | 7,034
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 62,248 | 58,136
Accumulated Amortization | 17,166 | 14,076
Net Book Value | 45,082 | 44,060
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,060 | 13,600
Accumulated Amortization | 13,619 | 9,067
Net Book Value | $ 441 | $ 4,533

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