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Business Segment and Related Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | segment     2    
Segment Reporting Information [Line Items]          
Revenue $ 133,145 $ 120,936 $ 297,776 $ 284,194  
Segment gross (loss) profit 10,734 (2,065) 21,531 13,314  
Segment depreciation and amortization expense 6,750 5,378 13,274 11,635  
Expenditures for segment assets 420 4,351 1,604 11,491  
Property and equipment, net 75,155   75,155   $ 85,294
Segment goodwill 74,213   74,213   74,213
Maintenance and Technical Services          
Segment Reporting Information [Line Items]          
Revenue 95,283 83,986 223,249 188,861  
Operating Segments          
Segment Reporting Information [Line Items]          
Property and equipment, net 75,155   75,155   85,294
Segment goodwill 74,213   74,213   74,213
Operating Segments | Environmental Solutions          
Segment Reporting Information [Line Items]          
Revenue 37,862 36,950 74,527 95,333  
Segment gross (loss) profit 4,233 (9,188) 8,085 (921)  
Segment depreciation and amortization expense 2,258 1,376 4,338 3,690  
Expenditures for segment assets 497 3,186 1,059 6,957  
Property and equipment, net 43,821   43,821   47,856
Segment goodwill 57,591   57,591   57,591
Operating Segments | Maintenance and Technical Services          
Segment Reporting Information [Line Items]          
Revenue 95,283 83,986 223,249 188,861  
Segment gross (loss) profit 6,501 7,123 13,446 14,235  
Segment depreciation and amortization expense 2,520 2,012 4,993 3,966  
Expenditures for segment assets (83) 1,133 512 4,502  
Property and equipment, net 31,108   31,108   37,251
Segment goodwill 16,622   16,622   16,622
All Other          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Segment gross (loss) profit 0 0 0 0  
Segment depreciation and amortization expense 1,972 1,990 3,943 3,979  
Expenditures for segment assets 6 $ 32 33 $ 32  
Property and equipment, net 226   226   187
Segment goodwill $ 0   $ 0   $ 0