Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets [Abstract]

Changes in Carrying Amount of Goodwill

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

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(a)As of December 31, 2019, accumulated impairment was $867.8 million.