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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Purchase Price:
Cash used in acquisitions, net of cash acquired	$ 4,568	$ 5,144
Allocated as follows:
Excess purchase price allocated to goodwill	196,316		$ 194,901
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired	3,465	4,771
Holdbacks	385	580
Total	3,850	5,351
Allocated as follows:
Land	0	325
Buildings	0	678
Equipment	1,254	2,396
Intangible assets	1,285	1,225
Other liabilities, net	(76)	(80)
Fair value of assets acquired and liabilities assumed	2,463	4,544
Excess purchase price allocated to goodwill	$ 1,387	$ 807

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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