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BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 75,379 $ 88,918 $ 5,056
Excess purchase price to be allocated to goodwill 185,819 162,734 122,605
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 72,118 86,686 4,823
Notes payable 2,714 0 2,400
Class A common stock issued 0 4,258 0
Other non-cash considerations 5,470 0 101
Contingent consideration and holdbacks 1,875 8,521 736
Total 82,177 99,465 8,060
Current assets 2,051 3,276 93
Non-current assets 367 0 0
Land 2,487 0 0
Buildings 5,422 7,889 0
Equipment 20,482 23,882 2,994
Other liabilities, net (3,122) (4,708) (49)
Deferred tax liability (2,385) (937) 0
Intangible assets 31,171 29,934 2,334
Fair value of assets acquired and liabilities assumed 56,473 59,336 5,372
Excess purchase price to be allocated to goodwill $ 25,704 $ 40,129 $ 2,688