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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Allocated as follows:      
Excess purchase price allocated to goodwill $ 119,899   $ 118,976
Transfer Stations Acquisition      
Purchase Price:      
Cash used in acquisitions 2,439 $ 0  
Holdbacks 400 0  
Total 2,839 0  
Allocated as follows:      
Current assets 40 0  
Land 353 0  
Buildings 1,360 0  
Equipment 269 0  
Other liabilities, net (106) 0  
Fair value of assets acquired and liabilities assumed 1,916 0  
Excess purchase price allocated to goodwill $ 923 $ 0