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BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 88,918 $ 5,056 $ 2,839
Excess purchase price to be allocated to goodwill 162,734 122,605 119,899
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 86,686 4,823 2,439
Notes payable 0 2,400 0
Class A common stock issued 4,258 0 0
Other non-cash considerations 0 101 0
Contingent consideration and holdbacks 8,521 736 400
Total 99,465 8,060 2,839
Current assets 3,276 93 40
Land 0 0 353
Buildings 7,889 0 1,360
Equipment 23,882 2,994 269
Other liabilities, net (4,708) (49) (106)
Deferred tax liability (937) 0 0
Intangible assets 29,934 2,334 0
Fair value of assets acquired and liabilities assumed 59,336 5,372 1,916
Excess purchase price to be allocated to goodwill $ 40,129 $ 2,688 $ 923