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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 27,687 $ 19,369  
Allocated as follows:      
Excess purchase price allocated to goodwill 169,866   $ 162,734
Waste Collection Acquisitions      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 25,546 19,189  
Notes payable 2,250 0  
Contingent consideration and holdbacks 1,120 172  
Total 28,916 19,361  
Allocated as follows:      
Current assets 1,865 1,640  
Land 726 0  
Buildings 2,602 5,578  
Equipment 8,655 4,642  
Intangible assets 11,619 2,700  
Other liabilities, net (1,546) (1,276)  
Deferred tax liability (2,137) (1,635)  
Fair value of assets acquired and liabilities assumed 21,784 11,649  
Excess purchase price allocated to goodwill $ 7,132 $ 7,712