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Revenue From Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 463,449	$ 383,458	$ 1,180,431	$ 1,080,184
Fixed-Unit Price
Disaggregation of Revenue [Line Items]
Revenues	267,093	187,692	670,526	631,639
Lump Sum
Disaggregation of Revenue [Line Items]
Revenues	129,742	148,463	348,313	301,025
Residential and Other
Disaggregation of Revenue [Line Items]
Revenues	66,614	47,303	161,592	147,520
Heavy Civil
Disaggregation of Revenue [Line Items]
Revenues	249,898	201,078	600,105	577,141
Heavy Civil | Heavy Highway
Disaggregation of Revenue [Line Items]
Revenues	188,746	148,239	427,451	397,139
Heavy Civil | Aviation
Disaggregation of Revenue [Line Items]
Revenues	35,840	20,473	99,816	83,797
Heavy Civil | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Revenues	11,463	17,751	41,890	56,089
Heavy Civil | Other
Disaggregation of Revenue [Line Items]
Revenues	13,849	14,615	30,948	40,116
Specialty Services
Disaggregation of Revenue [Line Items]
Revenues	148,256	139,971	424,248	380,397
Specialty Services | Site Development
Disaggregation of Revenue [Line Items]
Revenues	121,286	114,961	341,601	296,845
Specialty Services | Commercial
Disaggregation of Revenue [Line Items]
Revenues	26,970	25,010	82,647	83,552
Residential
Disaggregation of Revenue [Line Items]
Revenues	$ 65,295	$ 42,409	$ 156,078	$ 122,646

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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