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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Purchase Price:      
Cash used in acquisitions, net of cash acquired $ 20,091 $ 27,687  
Allocated as follows:      
Excess purchase price allocated to goodwill 190,966   $ 185,819
Waste Collection Acquisitions      
Purchase Price:      
Cash used in acquisitions, net of cash acquired 19,212 25,546  
Notes payable 0 2,250  
Contingent consideration and holdbacks 2,837 1,120  
Total 22,049 28,916  
Allocated as follows:      
Current assets 132 1,865  
Land 685 726  
Buildings 2,118 2,602  
Equipment 8,277 8,655  
Intangible assets 5,912 11,619  
Other liabilities, net (222) (1,546)  
Deferred tax liability 0 (2,137)  
Fair value of assets acquired and liabilities assumed 16,902 21,784  
Excess purchase price allocated to goodwill $ 5,147 $ 7,132