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BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 32,457 $ 75,379 $ 88,918
Excess purchase price to be allocated to goodwill 194,901 185,819 162,734
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 28,990 72,118 86,686
Notes payable 0 2,714 0
Class A common stock issued 0 0 4,258
Other non-cash considerations 0 5,470 0
Contingent consideration and holdbacks 4,490 1,875 8,521
Total 33,480 82,177 99,465
Current assets 181 2,051 3,276
Non-current assets 0 367 0
Land 895 2,487 0
Buildings 1,908 5,422 7,889
Equipment 13,493 20,482 23,882
Other liabilities, net (484) (3,122) (4,708)
Deferred tax liability 0 (2,385) (937)
Intangible assets 8,405 31,171 29,934
Fair value of assets acquired and liabilities assumed 24,398 56,473 59,336
Excess purchase price to be allocated to goodwill $ 9,082 $ 25,704 $ 40,129