Related Party Transactions (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2017 Property	Dec. 31, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Rent expense		$ 21,160	$ 26,664	$ 20,006
Number of properties sold to a non-related party | Property	1
Terra Contracting LLC [Member]
Related Party Transaction [Line Items]
Rent expense				195
Number of facilities owned by former owner | Facility		2
Great Lakes Environmental & Infrastructure, LLC [Member]
Related Party Transaction [Line Items]
Lease termination date		Nov. 11, 2016
Magnus Pacific Corporation [Member]
Related Party Transaction [Line Items]
Rent expense		$ 222	$ 263	$ 506
Number of facilities owned by former owner | Facility		2