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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
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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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