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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 270,091 | $ 241,809
Accumulated Amortization | 116,529 | 92,019
Net Book Value | 153,562 | 149,790
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 169,334 | 148,635
Accumulated Amortization | 69,388 | 52,514
Net Book Value | 99,946 | 96,121
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,959 | 14,682
Accumulated Amortization | 10,617 | 7,572
Net Book Value | 6,342 | 7,110
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 69,718 | 64,432
Accumulated Amortization | 22,609 | 18,256
Net Book Value | 47,109 | 46,176
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,080 | 14,060
Accumulated Amortization | 13,915 | 13,677
Net Book Value | $ 165 | $ 383

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