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Revenue Recognition - Schedule of revenue by contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Contract revenues	$ 518,470	$ 468,094
Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 518,470	$ 468,094
Concentration risk	100.00%	100.00%
Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 339,541	$ 267,035
Concentration risk	65.50%	57.00%
Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 81,386	$ 61,182
Concentration risk	15.70%	13.10%
TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 83,853	$ 88,839
Concentration risk	16.20%	19.00%
Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 13,690	$ 51,038
Concentration risk	2.60%	10.90%
T&D [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 259,270	$ 272,548
Concentration risk	100.00%	100.00%
T&D [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 121,002	$ 133,324
Concentration risk	46.70%	48.90%
T&D [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 63,310	$ 51,194
Concentration risk	24.40%	18.80%
T&D [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 68,051	$ 76,308
Concentration risk	26.20%	28.00%
T&D [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 6,907	$ 11,722
Concentration risk	2.70%	4.30%
C&I [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 259,200	$ 195,546
Concentration risk	100.00%	100.00%
C&I [Member] | Fixed-price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 218,539	$ 133,711
Concentration risk	84.30%	68.40%
C&I [Member] | Unit Price Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 18,076	$ 9,988
Concentration risk	7.00%	5.10%
C&I [Member] | TE Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 15,802	$ 12,531
Concentration risk	6.10%	6.40%
C&I [Member] | Other Contract [Member] | Revenue from Contract with Customer [Member]
Disaggregation of Revenue [Line Items]
Contract revenues	$ 6,783	$ 39,316
Concentration risk	2.60%	20.10%

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