Acquisitions - Acquired Intangible Assets (Details) - USD ($) $ in Thousands		1 Months Ended
	Apr. 01, 2020	Dec. 31, 2020
TAS Energy
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 53,400
TAS Energy | Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year
Estimated Fair Value	$ 5,200
TAS Energy | Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	25 years
Estimated Fair Value	$ 8,200
TAS Energy | Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Estimated Fair Value	$ 40,000
T E C Industrial Construction and Maintenance
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value		$ 37,200
T E C Industrial Construction and Maintenance | Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		2 years
Estimated Fair Value		$ 7,200
T E C Industrial Construction and Maintenance | Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		20 years
Estimated Fair Value		$ 5,800
T E C Industrial Construction and Maintenance | Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life		9 years
Estimated Fair Value		$ 24,200