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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]          
Goodwill   $ 1,479,050 $ 1,477,199   $ 1,287,736
Measurement Period Adjustments, Goodwill   $ 47 218    
HEPACO          
Business Combination [Line Items]          
Accounts receivable, including unbilled receivables $ 68,216   69,072    
Inventories and supplies 384   384    
Prepaid expenses and other current assets 4,260   4,383    
Property, plant and equipment 47,510   47,125    
Permits and other intangibles 130,500   130,500    
Operating lease right-of-use assets 9,385   9,385    
Other long-term assets 6,845   5,712    
Accounts payable (30,602)   (30,602)    
Accrued expenses and other current liabilities (16,305)   (16,005)    
Current portion of operating lease liabilities (2,758)   (2,758)    
Operating lease liabilities, less current portion (6,627)   (6,627)    
Closure and post-closure liabilities (2,877)   (2,492)    
Remedial liabilities (2,435)   (2,435)    
Other long-term liabilities (374)   (374)    
Total identifiable net assets 205,122   205,268    
Goodwill 187,057   186,911    
Total purchase price 392,179   392,179    
Measurement Period Adjustments, Accounts receivable, including unbilled receivables (856)        
Measurement Period Adjustments, Prepaid expenses and other current assets (123)        
Measurement Period Adjustments, Property, plant and equipment 385        
Measurement Period Adjustments, Other non-current assets 1,133        
Measurement Period Adjustments, Accrued expenses and other current liabilities (300)        
Measurement Period Adjustments, Closure and post closure liabilities (385)        
Measurement Period Adjustments, Total identifiable net assets (146)        
Measurement Period Adjustments, Goodwill 146        
Measurement Period Adjustments, Total purchase price 0        
Noble Oil Services , Inc. Acquisition          
Business Combination [Line Items]          
Accounts receivable, including unbilled receivables 5,847   5,855    
Inventories and supplies 6,598   6,598    
Prepaid expenses and other current assets 408   408    
Property, plant and equipment 55,650   55,615    
Permits and other intangibles 14,500   14,500    
Operating lease right-of-use assets 3,615   3,615    
Other long-term assets 92   92    
Accounts payable (7,752)   (7,752)    
Accrued expenses and other current liabilities (1,128)   (1,145)    
Current portion of operating lease liabilities (1,823)   (1,823)    
Operating lease liabilities, less current portion (1,792)   (1,792)    
Closure and post-closure liabilities (8,964)   (8,929)    
Remedial liabilities (2,667)   (2,757)    
Total identifiable net assets 62,584   62,485    
Goodwill 6,158   6,257    
Total purchase price 68,742   $ 68,742    
Measurement Period Adjustments, Accounts receivable, including unbilled receivables (8)        
Measurement Period Adjustments, Property, plant and equipment 35        
Measurement Period Adjustments, Accrued expenses and other current liabilities 17        
Measurement Period Adjustments, Closure and post closure liabilities (35)        
Measurement Period Adjustments, Remedial liabilities 90        
Measurement Period Adjustments, Total identifiable net assets 99        
Measurement Period Adjustments, Goodwill (99)        
Measurement Period Adjustments, Total purchase price $ 0        
Thompson Industrial          
Business Combination [Line Items]          
Accounts receivable, including unbilled receivables       $ 25,160  
Inventories and supplies       228  
Prepaid expenses and other current assets       1,302  
Property, plant and equipment       26,719  
Permits and other intangibles       28,900  
Operating lease right-of-use assets       4,716  
Other long-term assets       72  
Accounts payable       (7,240)  
Accrued expenses and other current liabilities       (3,290)  
Current portion of operating lease liabilities       (1,653)  
Operating lease liabilities, less current portion       (3,063)  
Other long-term liabilities       (560)  
Total identifiable net assets       71,291  
Goodwill       39,564  
Total purchase price       $ 110,855