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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 153,112 $ 25,379  
Allocated as follows:      
Excess purchase price allocated to goodwill 227,929   $ 194,901
Waste Collection Acquisitions      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 150,364 23,062  
Contingent consideration 3,000 0  
Holdbacks 1,865 3,387  
Total 155,229 26,449  
Allocated as follows:      
Current assets 7,260 227  
Operating lease right-of-use assets 6,500 0  
Land 803 895  
Finance lease right-of-use-assets 31,467 0  
Buildings and improvements 8,468 1,908  
Equipment 42,458 10,006  
Intangible assets 41,759 7,159  
Other liabilities, net (5,120) (306)  
Finance leases (11,367) 0  
Fair value of assets acquired and liabilities assumed 122,228 19,889  
Excess purchase price allocated to goodwill $ 33,001 $ 6,560