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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allocated as follows:      
Excess purchase price allocated to goodwill $ 151,029   $ 122,605
Transfer Stations Acquisition      
Purchase Price:      
Cash paid for acquisitions 57,824 $ 3,383  
Notes payable 0 2,400  
Common stock 4,258 0  
Other non-cash consideration 0 101  
Contingent consideration and holdbacks 4,996 376  
Total 67,078 6,260  
Allocated as follows:      
Current assets 2,968 0  
Building 7,539 0  
Equipment 11,520 2,452  
Intangible assets 20,300 1,670  
Other liabilities, net (2,443) (49)  
Deferred tax liability (1,230) 0  
Fair value of assets acquired and liabilities assumed 38,654 4,073  
Excess purchase price allocated to goodwill $ 28,424 $ 2,187