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Acquisitions - Contingent Earn-out Obligation (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended								9 Months Ended	12 Months Ended
	Apr. 01, 2020	Dec. 31, 2020	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Revenues			$ 698,961	$ 714,099	$ 743,468	$ 700,131	$ 719,584	$ 706,918	$ 650,302	$ 538,473		$ 2,856,659	$ 2,615,277	$ 2,182,879
Federal
Business Acquisition [Line Items]
Net operating loss carryforwards	$ 53,200	$ 44,900	44,900								$ 44,900	44,900
State
Business Acquisition [Line Items]
Net operating loss carryforwards	$ 6,500	$ 46,200	46,200								46,200	46,200
TAS Energy
Business Acquisition [Line Items]
Revenues											106,400
Contingent earn-out period	27 months
Contingent earn-out estimated milestone payment, minimum	$ 1,000
Contingent earn-out estimated milestone payment, maximum	$ 8,000
Cash flow discount rate	17.70%
TAS Energy | Minimum
Business Acquisition [Line Items]
Cash flow discount rate	15.00%
TAS Energy | Maximum
Business Acquisition [Line Items]
Cash flow discount rate	23.50%
T E C Industrial Construction and Maintenance
Business Acquisition [Line Items]
Contingent earn-out period		3 years
Contingent earn-out estimated milestone payment, minimum		$ 1,000	1,000								1,000	1,000
Contingent earn-out estimated milestone payment, maximum		$ 5,000	$ 5,000								$ 5,000	$ 5,000
Cash flow discount rate		12.90%
T E C Industrial Construction and Maintenance | Minimum
Business Acquisition [Line Items]
Cash flow discount rate		14.00%
T E C Industrial Construction and Maintenance | Maximum
Business Acquisition [Line Items]
Cash flow discount rate		15.00%

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