Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021:

(in thousands)	Civil		Building		Specialty Contractors		Total
Gross goodwill as of December 31, 2020	$	492,074	$	424,724	$	156,193	$	1,072,991
Accumulated impairment as of December 31, 2020	(286,931)		(424,724)		(156,193)		(867,848)
Goodwill as of December 31, 2020	205,143		—		—		205,143
Current year activity	—		—		—		—
Goodwill as of March 31, 2021	$	205,143	$	—	$	—	$	205,143

Intangible Assets

Intangible assets consist of the following:

	As of March 31, 2021								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		(24,377)		(23,232)		26,741		20 years
Contractor license	6,000		—		(6,000)		—		N/A
Customer relationships	39,800		(22,366)		(16,645)		789		12 years
Construction contract backlog	149,290		(110,758)		—		38,532		3 years
Total	$	387,040	$	(157,501)	$	(113,067)	$	116,472

	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