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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 241,809 | $ 204,558
Accumulated Amortization | 92,019 | 66,567
Net Book Value | 149,790 | 137,991
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 148,635 | 121,015
Accumulated Amortization | 52,514 | 38,651
Net Book Value | 96,121 | 82,364
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,682 | 11,807
Accumulated Amortization | 7,572 | 4,773
Net Book Value | 7,110 | 7,034
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 64,432 | 58,136
Accumulated Amortization | 18,256 | 14,076
Net Book Value | 46,176 | 44,060
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,060 | 13,600
Accumulated Amortization | 13,677 | 9,067
Net Book Value | $ 383 | $ 4,533

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