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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 56,250 $ 5,481  
Allocated as follows:      
Excess purchase price allocated to goodwill 262,508   $ 232,860
Waste Collection Acquisitions      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 55,053 4,378  
Holdbacks 3,842 505  
Total consideration 58,895 4,883  
Allocated as follows:      
Current assets 7,584 13  
Land 2,804 0  
Buildings and improvements 5,308 0  
Equipment 6,712 1,549  
Operating lease right-of-use assets 405 0  
Other non-current assets 40 0  
Current liabilities (3,577) (82)  
Operating lease liabilities, less current portion (282) 0  
Fair value of assets acquired and liabilities assumed 30,134 3,126  
Excess purchase price allocated to goodwill 28,761 1,757  
Waste Collection Acquisitions | Covenants not-to-compete      
Allocated as follows:      
Intangible assets: 1,415 420  
Waste Collection Acquisitions | Customer Relationships      
Allocated as follows:      
Intangible assets: $ 9,725 $ 1,226