Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 274,635	$ 270,091
Accumulated Amortization	123,209	116,529
Net Book Value	151,426	153,562
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	171,945	169,334
Accumulated Amortization	74,061	69,388
Net Book Value	97,884	99,946
Covenants Not-to-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,189	16,959
Accumulated Amortization	11,391	10,617
Net Book Value	5,798	6,342
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	70,891	69,718
Accumulated Amortization	23,752	22,609
Net Book Value	47,139	47,109
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,610	14,080
Accumulated Amortization	14,005	13,915
Net Book Value	$ 605	$ 165