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BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 170,647 $ 32,457 $ 75,379
Allocated as follows:      
Finance lease right-of-use-assets     0
Finance leases     0
Excess purchase price to be allocated to goodwill 232,860 194,901 185,819
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 166,489 28,990 72,118
Notes payable 0 0 2,714
Other non-cash consideration 0 0 5,470
Holdbacks to sellers and contingent consideration 5,194 4,490 1,875
Total 171,683 33,480 82,177
Allocated as follows:      
Current assets 7,218 181 2,051
Land 1,321 895 2,487
Finance lease right-of-use-assets 31,467 0  
Buildings 11,046 1,908 5,422
Equipment 46,396 13,493 20,482
Operating lease right-of-use assets 6,500 0 0
Other non-current assets 0 0 367
Other liabilities, net (5,182) (484) (3,122)
Finance leases (11,367) 0  
Deferred tax liability 0 0 (2,385)
Fair value of assets acquired and liabilities assumed 133,751 24,398 56,473
Excess purchase price to be allocated to goodwill 37,932 9,082 25,704
Transfer Stations Acquisition | Trade Names      
Allocated as follows:      
Intangible assets 8,350 0 0
Transfer Stations Acquisition | Covenants Not-to-Compete      
Allocated as follows:      
Intangible assets 1,807 742 4,412
Transfer Stations Acquisition | Customer Relationships      
Allocated as follows:      
Intangible assets $ 36,195 $ 7,663 $ 26,759