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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 292,305 | $ 270,091
Accumulated Amortization | 136,907 | 116,529
Net Book Value | 155,398 | 153,562
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 184,562 | 169,334
Accumulated Amortization | 83,719 | 69,388
Net Book Value | 100,843 | 99,946
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,944 | 16,959
Accumulated Amortization | 12,761 | 10,617
Net Book Value | 6,183 | 6,342
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 73,543 | 69,718
Accumulated Amortization | 26,042 | 22,609
Net Book Value | 47,501 | 47,109
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,256 | 14,080
Accumulated Amortization | 14,385 | 13,915
Net Book Value | $ 871 | $ 165

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