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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Contract revenues	$ 607,901	$ 583,214	$ 1,639,422	$ 1,500,084
Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
Fixed-price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 374,983	$ 378,229	$ 1,028,536	$ 879,953
Fixed-price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	61.70%	64.90%	62.70%	58.70%
Unit Price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 111,168	$ 68,910	$ 296,230	$ 195,109
Unit Price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	18.30%	11.80%	18.10%	13.00%
T&E Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 104,036	$ 117,167	$ 271,273	$ 320,040
T&E Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	17.10%	20.10%	16.60%	21.30%
Other Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 17,714	$ 18,908	$ 43,383	$ 104,982
Other Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	2.90%	3.20%	2.60%	7.00%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues	$ 299,739	$ 294,940	$ 835,768	$ 823,398
T&D | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
T&D | Fixed-price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 126,387	$ 157,357	$ 373,739	$ 410,253
T&D | Fixed-price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	42.20%	53.40%	44.70%	49.80%
T&D | Unit Price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 88,579	$ 49,392	$ 236,518	$ 152,748
T&D | Unit Price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	29.60%	16.70%	28.30%	18.60%
T&D | T&E Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 79,714	$ 84,299	$ 209,397	$ 237,448
T&D | T&E Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	26.60%	28.60%	25.10%	28.80%
T&D | Other Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 5,059	$ 3,892	$ 16,114	$ 22,949
T&D | Other Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	1.60%	1.30%	1.90%	2.80%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues	$ 308,162	$ 288,274	$ 803,654	$ 676,686
C&I | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
C&I | Fixed-price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 248,596	$ 220,872	$ 654,797	$ 469,700
C&I | Fixed-price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	80.70%	76.60%	81.50%	69.40%
C&I | Unit Price Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 22,589	$ 19,518	$ 59,712	$ 42,361
C&I | Unit Price Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	7.30%	6.80%	7.40%	6.30%
C&I | T&E Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 24,322	$ 32,868	$ 61,876	$ 82,592
C&I | T&E Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	7.90%	11.40%	7.70%	12.20%
C&I | Other Contract
Disaggregation of Revenue [Line Items]
Contract revenues	$ 12,655	$ 15,016	$ 27,269	$ 82,033
C&I | Other Contract | Product Concentration Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk	4.10%	5.20%	3.40%	12.10%

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