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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 245,317 | $ 241,809
Accumulated Amortization | 97,908 | 92,019
Net Book Value | 147,409 | 149,790
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 150,735 | 148,635
Accumulated Amortization | 56,530 | 52,514
Net Book Value | 94,205 | 96,121
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,090 | 14,682
Accumulated Amortization | 8,325 | 7,572
Net Book Value | 6,765 | 7,110
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 65,432 | 64,432
Accumulated Amortization | 19,319 | 18,256
Net Book Value | 46,113 | 46,176
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,060 | 14,060
Accumulated Amortization | 13,734 | 13,677
Net Book Value | $ 326 | $ 383

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