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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Contract revenues	$ 592,486	$ 518,470
Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 379,640	$ 339,541
Fixed price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	64.10%	65.50%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 103,700	$ 81,386
Unit price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	17.50%	15.70%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 84,660	$ 83,853
T&E | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	14.30%	16.20%
Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 24,486	$ 13,690
Other | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	4.10%	2.60%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 314,908	$ 259,270
T&D | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
T&D | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 151,931	$ 121,002
T&D | Fixed price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	48.20%	46.70%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 85,269	$ 63,310
T&D | Unit price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	27.10%	24.40%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 70,278	$ 68,051
T&D | T&E | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	22.30%	26.20%
T&D | Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 7,430	$ 6,907
T&D | Other | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	2.40%	2.70%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 277,578	$ 259,200
C&I | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	100.00%	100.00%
C&I | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 227,709	$ 218,539
C&I | Fixed price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	82.00%	84.30%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues	$ 18,431	$ 18,076
C&I | Unit price | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	6.60%	7.00%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues	$ 14,382	$ 15,802
C&I | T&E | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	5.20%	6.10%
C&I | Other
Disaggregation of Revenue [Line Items]
Contract revenues	$ 17,056	$ 6,783
C&I | Other | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, Percent	6.20%	2.60%

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