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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Allocated as follows:      
Excess purchase price allocated to goodwill $ 122,085   $ 119,899
Transfer Stations Acquisition      
Purchase Price:      
Cash paid for acquisitions 3,383 $ 2,439  
Notes payable 2,400 0  
Other non-cash considerations 101 0  
Holdbacks 376 400  
Total 6,260 2,839  
Allocated as follows:      
Current assets 0 40  
Land 0 353  
Building 0 1,360  
Equipment 2,452 269  
Intangible assets 1,670 0  
Other liabilities, net (49) (106)  
Fair value of assets acquired and liabilities assumed 4,073 1,916  
Excess purchase price allocated to goodwill $ 2,187 $ 923