Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The following table presents the changes in the carrying amount of goodwill since its inception through December 31, 2020:

(in thousands)	Civil		Building		Specialty Contractors		Total
Gross goodwill as of December 31, 2018	$	492,074	$	424,724	$	156,193	$	1,072,991
Accumulated impairment as of December 31, 2018	(76,716)		(411,269)		—		(487,985)
Goodwill as of December 31, 2018	415,358		13,455		156,193		585,006
2019 impairment	(210,215)		(13,455)		(156,193)		(379,863)
Goodwill as of December 31, 2019	205,143		—		—		205,143
Current year activity	—		—		—		—
Goodwill as of December 31, 2020(a)	$	205,143	$	—	$	—	$	205,143

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(a)As of December 31, 2020, accumulated impairment was $867.8 million.

Schedule of Finite and Indefinite Lived Intangible Assets

Intangible assets consist of the following:

	As of December 31, 2020								Weighted-Average Amortization Period
(in thousands)	Cost		Accumulated Amortization		Accumulated Impairment Charge		Carrying Value
Trade names (non-amortizable)	$	117,600	$	—	$	(67,190)	$	50,410	Indefinite
Trade names (amortizable)	74,350		(23,754)		(23,232)		27,364		20 years
Contractor license	6,000		—		(6,000)		—		N/A
Customer relationships	39,800		(22,103)		(16,645)		1,052		12 years
Construction contract backlog	149,290		(105,001)		—		44,289		3 years
Total	$	387,040	$	(150,858)	$	(113,067)	$	123,115

	As of December 31, 2019								Weighted-Average Amortization Period
(in thousands)	Cost		Accumulated Amortization		Accumulated Impairment Charge		Carrying Value
Trade names (non-amortizable)	$	117,600	$	—	$	(67,190)	$	50,410	Indefinite
Trade names (amortizable)	74,350		(21,267)		(23,232)		29,851		20 years
Contractor license	6,000		—		(6,000)		—		N/A
Customer relationships	39,800		(21,048)		(16,645)		2,107		12 years
Construction contract backlog	149,290		(76,388)		—		72,902		3 years
Total	$	387,040	$	(118,703)	$	(113,067)	$	155,270