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Business Acquisitions - Summary of Purchase Price Attributable to Acquisitions (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Apr. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Business Acquisition [Line Items]        
Cash       $ 1,863
Accounts receivable       2,670
Other current assets       31
Current assets       4,564
Property plant and equipment       2,450
Goodwill $ 273,096   $ 127,058 17,893
Total assets       41,414
Current liabilities       748
Total liabilities       2,431
Purchase price       38,983
Non- current liabilities       1,683
Customer Relationships        
Business Acquisition [Line Items]        
Intangible assets       11,823
Trade Names        
Business Acquisition [Line Items]        
Intangible assets       463
Covenants Not to Compete        
Business Acquisition [Line Items]        
Intangible assets       1,661
Proprietary Software        
Business Acquisition [Line Items]        
Intangible assets       $ 2,560
CTEH        
Business Acquisition [Line Items]        
Cash   $ 1,527    
Accounts receivable   17,059    
Other current assets   1,265    
Current assets   19,851    
Property plant and equipment   7,042    
Goodwill   146,038    
Total assets   251,831    
Current liabilities   9,721    
Total liabilities   9,721    
Purchase price   242,110    
CTEH | Customer Relationships        
Business Acquisition [Line Items]        
Intangible assets   56,000    
CTEH | Trade Names        
Business Acquisition [Line Items]        
Intangible assets   4,200    
CTEH | Covenants Not to Compete        
Business Acquisition [Line Items]        
Intangible assets   4,000    
CTEH | Proprietary Software        
Business Acquisition [Line Items]        
Intangible assets   $ 14,700