The amount of carrying value of good will over fair value.

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Amount of increase (decrease) from foreign currency translation adjustments and other increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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It represents amount of Reversal of Impairment Charges

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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No definition available.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Oct. 01, 2020	Nov. 01, 2019
Changes in goodwill
Balance at the beginning of the period			$ 766,980	$ 413,037	$ 766,980
Foreign currency translation				89	645
Balance at the end of the period	$ 413,126	$ 413,037		413,126	413,037
Impairment charges of finite-lived assets		0
Permits and license
Changes in goodwill
Non-amortizing intangible assets						$ 57,100
Impairment charges of finite-lived assets	0	21,100
NRC
Changes in goodwill
Impairment charges					(383,800)
NRC Merger purchase price allocation adjustment					28,912
Balance at the end of the period	577,400			577,400
Non-amortizing intangible assets	57,100			57,100
Total identified intangible assets							$ 252,100
Accumulated Impairment
NRC Merger purchase price allocation adjustment					28,912
NRC \| Permits and license
Changes in goodwill
Non-amortizing intangible assets							$ 57,400
Impact Environmental Services Inc
Changes in goodwill
Acquisition					300
EW
Changes in goodwill
Impairment charges			(283,600)
Accumulated Impairment
Goodwill, Period Increase (Decrease)		80,300
International reporting unit
Changes in goodwill
Impairment charges			(16,700)
Accumulated Impairment
Reversal of impairment charges		11,200
Environmental Services
Changes in goodwill
Balance at the beginning of the period			166,415	166,863	166,415
Foreign currency translation				62	448
Balance at the end of the period	166,925	166,863		166,925	166,863
Accumulated Impairment
Accumulated impairment at the beginning			(6,870)	(6,870)	(6,870)
Accumulated impairment at the ending	(6,870)	(6,870)		(6,870)	(6,870)
Energy Waste
Changes in goodwill
Balance at the beginning of the period			308,856	399,503	308,856
Balance at the end of the period	399,503	399,503		399,503	399,503
Accumulated Impairment
Accumulated impairment at the beginning				(363,900)
Accumulated impairment at the ending	(363,900)	(363,900)		(363,900)	(363,900)
Energy Waste \| NRC
Changes in goodwill
Impairment charges					(363,900)
NRC Merger purchase price allocation adjustment					90,647
Accumulated Impairment
NRC Merger purchase price allocation adjustment					90,647
Field & Industrial Services
Changes in goodwill
Balance at the beginning of the period			$ 298,579	237,341	298,579
Impairment charges		(14,400)
Foreign currency translation				27	197
Balance at the end of the period	237,368	237,341		237,368	237,341
Accumulated Impairment
Accumulated impairment at the beginning				(19,900)
Accumulated impairment at the ending	$ (19,900)	$ (19,900)		$ (19,900)	(19,900)
Carrying value greater than fair value						$ 14,400
Field & Industrial Services \| NRC
Changes in goodwill
Impairment charges					(19,900)
NRC Merger purchase price allocation adjustment					(61,735)
Accumulated Impairment
NRC Merger purchase price allocation adjustment					(61,735)
Field & Industrial Services \| Impact Environmental Services Inc
Changes in goodwill
Acquisition					$ 300