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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 254,405	$ 241,809
Accumulated Amortization	110,084	92,019
Net Book Value	144,321	149,790
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	157,242	148,635
Accumulated Amortization	64,884	52,514
Net Book Value	92,358	96,121
Covenants Not-to-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,035	14,682
Accumulated Amortization	9,857	7,572
Net Book Value	6,178	7,110
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,048	64,432
Accumulated Amortization	21,489	18,256
Net Book Value	45,559	46,176
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,080	14,060
Accumulated Amortization	13,854	13,677
Net Book Value	$ 226	$ 383

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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