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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 210,596 | $ 204,558
Accumulated Amortization | 73,711 | 66,567
Net Book Value | 136,885 | 137,991
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 124,860 | 121,015
Accumulated Amortization | 41,866 | 38,651
Net Book Value | 82,994 | 82,364
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,112 | 11,807
Accumulated Amortization | 5,423 | 4,773
Net Book Value | 6,689 | 7,034
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 60,024 | 58,136
Accumulated Amortization | 15,089 | 14,076
Net Book Value | 44,935 | 44,060
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,600 | 13,600
Accumulated Amortization | 11,333 | 9,067
Net Book Value | $ 2,267 | $ 4,533

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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