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GOODWILL AND INTANGIBLE ASSETS - Schedule of Activity and Balances Related to Goodwill by Reporting Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 122,605 $ 119,899
Acquisitions 40,129 2,706
Goodwill, ending balance 162,734 122,605
Eastern    
Goodwill [Roll Forward]    
Goodwill, beginning balance 19,192 17,429
Acquisitions 8,962 1,763
Goodwill, ending balance 28,154 19,192
Western    
Goodwill [Roll Forward]    
Goodwill, beginning balance 89,369 88,426
Acquisitions 31,167 943
Goodwill, ending balance 120,536 89,369
Recycling    
Goodwill [Roll Forward]    
Goodwill, beginning balance 12,315 12,315
Acquisitions 0 0
Goodwill, ending balance 12,315 12,315
Other    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,729 1,729
Acquisitions 0 0
Goodwill, ending balance $ 1,729 $ 1,729