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Revenue Recognition - Schedule of Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract revenues	$ 607,970	$ 607,901	$ 513,051	$ 518,470	$ 571,075	$ 583,214	$ 448,776	$ 468,094	$ 2,247,392	$ 2,071,159	$ 1,531,169
Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,409,337	$ 1,268,994	$ 814,431
Fixed price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									62.70%	61.30%	53.20%
Unit price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 415,470	$ 282,656	$ 232,769
Unit price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									18.50%	13.60%	15.20%
T&E
Disaggregation of Revenue [Line Items]
Contract revenues									$ 357,718	$ 418,713	$ 340,519
T&E | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									15.90%	20.20%	22.20%
Other
Disaggregation of Revenue [Line Items]
Contract revenues									$ 64,867	$ 100,796	$ 143,450
Other | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									2.90%	4.90%	9.40%
T&D
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,154,378	$ 1,134,411	$ 893,108
T&D | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
T&D | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 507,203	$ 564,251	$ 361,699
T&D | Fixed price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									43.90%	49.70%	40.50%
T&D | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 338,326	$ 228,223	$ 181,179
T&D | Unit price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									29.30%	20.10%	20.30%
T&D | T&E
Disaggregation of Revenue [Line Items]
Contract revenues									$ 285,158	$ 316,943	$ 305,581
T&D | T&E | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									24.70%	27.90%	34.20%
T&D | Other
Disaggregation of Revenue [Line Items]
Contract revenues									$ 23,691	$ 24,994	$ 44,649
T&D | Other | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									2.10%	2.30%	5.00%
C&I
Disaggregation of Revenue [Line Items]
Contract revenues									$ 1,093,014	$ 936,748	$ 638,061
C&I | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									100.00%	100.00%	100.00%
C&I | Fixed price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 902,134	$ 704,743	$ 452,732
C&I | Fixed price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									82.50%	75.20%	71.00%
C&I | Unit price
Disaggregation of Revenue [Line Items]
Contract revenues									$ 77,144	$ 54,433	$ 51,590
C&I | Unit price | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									7.10%	5.80%	8.10%
C&I | T&E
Disaggregation of Revenue [Line Items]
Contract revenues									$ 72,560	$ 101,770	$ 34,938
C&I | T&E | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									6.60%	10.90%	5.40%
C&I | Other
Disaggregation of Revenue [Line Items]
Contract revenues									$ 41,176	$ 75,802	$ 98,801
C&I | Other | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk									3.80%	8.10%	15.50%

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