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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Purchase Price:
Cash used in acquisitions, net of cash acquired	$ 5,481	$ 20,091
Allocated as follows:
Excess purchase price allocated to goodwill	196,686		$ 194,901
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired	4,378	19,212
Holdbacks	505	2,837
Total	4,883	22,049
Allocated as follows:
Current assets	13	132
Land	0	685
Buildings	0	2,118
Equipment	1,549	8,277
Intangible assets	1,646	5,912
Other liabilities, net	(82)	(222)
Fair value of assets acquired and liabilities assumed	3,126	16,902
Excess purchase price allocated to goodwill	$ 1,757	$ 5,147

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