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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 254,405 | $ 241,809
Accumulated Amortization | 110,084 | 92,019
Net Book Value | 144,321 | 149,790
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 157,242 | 148,635
Accumulated Amortization | 64,884 | 52,514
Net Book Value | 92,358 | 96,121
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,035 | 14,682
Accumulated Amortization | 9,857 | 7,572
Net Book Value | 6,178 | 7,110
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,048 | 64,432
Accumulated Amortization | 21,489 | 18,256
Net Book Value | 45,559 | 46,176
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,080 | 14,060
Accumulated Amortization | 13,854 | 13,677
Net Book Value | $ 226 | $ 383

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