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BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 5,056 $ 2,839 $ 0
Total      
Excess purchase price to be allocated to goodwill 122,605 119,899 118,976
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 4,823 2,439 0
Notes payable 2,400 0 0
Other non-cash considerations 101 0 0
Contingent consideration and holdbacks 736 400 0
Total      
Total 8,060 2,839 0
Current assets 93 40 0
Land 0 353 0
Buildings 0 1,360 0
Equipment 2,994 269 0
Other liabilities, net (49) (106) 0
Intangible assets 2,334 0 0
Fair value of assets acquired and liabilities assumed 5,372 1,916 0
Excess purchase price to be allocated to goodwill $ 2,688 $ 923 $ 0