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GOODWILL AND INTANGIBLE ASSETS - Schedule of Activity and Balances Related to Goodwill by Operating Segment (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning balance $ 118,976
Acquisitions 923
Goodwill, ending balance 119,899
Eastern Region  
Goodwill [Roll Forward]  
Goodwill, beginning balance 17,429
Acquisitions 0
Goodwill, ending balance 17,429
Western Region  
Goodwill [Roll Forward]  
Goodwill, beginning balance 87,503
Acquisitions 923
Goodwill, ending balance 88,426
Recycling  
Goodwill [Roll Forward]  
Goodwill, beginning balance 12,315
Acquisitions 0
Goodwill, ending balance 12,315
Other  
Goodwill [Roll Forward]  
Goodwill, beginning balance 1,729
Acquisitions 0
Goodwill, ending balance $ 1,729