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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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