Goodwill and Intangibles (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Change in Carrying Amount of Goodwill

The change in carrying amount of goodwill was as follows (in thousands):

	Goodwill (Gross)		Accumulated Impairment Losses		Goodwill (Net)
January 1, 2021	$	286,874	$	(70,004)	$	216,870
Business Combinations	40,206		—		40,206
Other	30		—		30
September 30, 2021	$	327,110	$	(70,004)	$	257,106

Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value

The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):

	As of September 30,						As of December 31,
	2021						2020
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	240,756	$	106,997	$	133,759	$	197,641	$	89,137	$	108,504
Covenants not-to-compete	24,973		15,628		9,345		20,309		13,436		6,873
Trademarks and tradenames	89,804		31,164		58,640		79,657		27,245		52,412
Backlog	20,425		18,069		2,356		18,847		15,243		3,604
	$	375,958	$	171,858	$	204,100	$	316,454	$	145,061	$	171,393

Schedule of Estimated Aggregate Annual Amortization

Remaining estimated aggregate annual amortization expense is as follows (amounts, in thousands, are for the fiscal year ended):

Remainder of 2021	$	9,509
2022	34,971
2023	30,650
2024	27,136
2025	21,731
Thereafter	80,103