BUSINESS COMBINATIONS - Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Aug. 03, 2021	Jul. 01, 2021	Jun. 01, 2021	May 03, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 297,525					$ 0	$ 0
Field 16, LLC (Heavy 16)
Business Acquisition [Line Items]
Accounts receivable, net					$ 510
Inventories					1,451
Prepaid expenses and other current assets					34
Property and equipment, net					1,078
Operating lease right-of-use assets					1,088
Other assets					25
Accounts payable					(1,055)
Accrued expenses and other current liabilities					(226)
Current portion of lease liabilities					(274)
Long-term lease liabilities					(868)
Net identifiable assets					1,763
Identifiable intangible assets					57,400
Goodwill					18,204
Total purchase price allocation					77,367
Field 16, LLC (Heavy 16) | Trademarks and trade names
Business Acquisition [Line Items]
Identifiable intangible assets					18,500
Field 16, LLC (Heavy 16) | Backlog
Business Acquisition [Line Items]
Identifiable intangible assets					200
Field 16, LLC (Heavy 16) | Customer relationship
Business Acquisition [Line Items]
Identifiable intangible assets					5,100
Field 16, LLC (Heavy 16) | Technology and formulations & recipes
Business Acquisition [Line Items]
Identifiable intangible assets					$ 33,600
H&G Entities
Business Acquisition [Line Items]
Accounts receivable, net				$ 3,308
Inventories				6,559
Prepaid expenses and other current assets				493
Property and equipment, net				358
Operating lease right-of-use assets				1,921
Other assets				213
Accounts payable				(1,320)
Accrued expenses and other current liabilities				(481)
Current portion of lease liabilities				(447)
Deferred taxes				(24,438)
Long-term lease liabilities				(1,501)
Net identifiable assets				(15,335)
Identifiable intangible assets				94,500
Goodwill				55,876
Total purchase price allocation				135,041
H&G Entities | Trademarks and trade names
Business Acquisition [Line Items]
Identifiable intangible assets				29,100
H&G Entities | Backlog
Business Acquisition [Line Items]
Identifiable intangible assets				200
H&G Entities | Customer relationship
Business Acquisition [Line Items]
Identifiable intangible assets				11,600
H&G Entities | Technology and formulations & recipes
Business Acquisition [Line Items]
Identifiable intangible assets				$ 53,600
Aurora
Business Acquisition [Line Items]
Accounts receivable, net			$ 6,967
Inventories			9,823
Prepaid expenses and other current assets			1,086
Property and equipment, net			18,619
Accounts payable			(4,279)
Accrued expenses and other current liabilities			(782)
Other long-term liabilities			(664)
Net identifiable assets			30,770
Identifiable intangible assets			5
Goodwill			149,505
Total purchase price allocation			180,280
Aurora | Other
Business Acquisition [Line Items]
Identifiable intangible assets			$ 5
Greenstar
Business Acquisition [Line Items]
Accounts receivable, net		$ 982
Inventories		7,089
Prepaid expenses and other current assets		447
Property and equipment, net		1,324
Operating lease right-of-use assets		2,393
Other assets		231
Accounts payable		(777)
Accrued expenses and other current liabilities		(1,436)
Current portion of lease liabilities		(624)
Long-term lease liabilities		(1,836)
Net identifiable assets		7,793
Identifiable intangible assets		247
Goodwill		75,578
Total purchase price allocation		83,618
Greenstar | Other
Business Acquisition [Line Items]
Identifiable intangible assets		$ 247