BUSINESS COMBINATION - Identifiable Intangible Assets Acquired (Details) - KMG $ in Thousands	Nov. 15, 2018 USD ($)
Acquired Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Fair value, intangible assets	$ 844,800
Trade name - Flowchem
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets acquired	46,000
Customer relationships - Flowchem
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 315,000
Estimated useful life	20 years
Customer relationships - Electronic chemicals
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 280,000
Estimated useful life	19 years
Customer relationships - all other
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 109,000
Customer relationships - all other | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	15 years
Customer relationships - all other | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	16 years
Technology and know-how
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 85,500
Technology and know-how | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	9 years
Technology and know-how | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	11 years
Trade name - all other
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 7,000
Trade name - all other | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year
Trade name - all other | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	15 years
EPA product registration rights
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 2,300
Estimated useful life	15 years