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Revenue From Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 315,316	$ 296,688
Fixed-Unit Price
Disaggregation of Revenue [Line Items]
Revenues	177,547	141,739
Lump Sum
Disaggregation of Revenue [Line Items]
Revenues	91,155	114,252
Residential and Other
Disaggregation of Revenue [Line Items]
Revenues	46,614	40,697
Heavy Civil
Disaggregation of Revenue [Line Items]
Revenues	147,054	155,615
Heavy Civil | Heavy Highway
Disaggregation of Revenue [Line Items]
Revenues	99,516	96,374
Heavy Civil | Aviation
Disaggregation of Revenue [Line Items]
Revenues	27,222	28,457
Heavy Civil | Water Containment and Treatment
Disaggregation of Revenue [Line Items]
Revenues	14,219	21,809
Heavy Civil | Other
Disaggregation of Revenue [Line Items]
Revenues	6,097	8,975
Specialty Services
Disaggregation of Revenue [Line Items]
Revenues	124,088	104,723
Specialty Services | Land Development
Disaggregation of Revenue [Line Items]
Revenues	96,572	76,245
Specialty Services | Commercial
Disaggregation of Revenue [Line Items]
Revenues	27,516	28,478
Residential
Disaggregation of Revenue [Line Items]
Revenues	$ 44,174	$ 36,350

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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.

+ References

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