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Acquisitions - Summary of Purchase Price Allocation for Major Components of Acquisition (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Jan. 29, 2021	Dec. 31, 2020
Assets:
Goodwill	$ 98,212		$ 27,972
2021 Acquisitions [Member] | INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member]
Assets:
Property, plant and equipment		$ 54,200
Identifiable intangibles assets		46,000
Goodwill		64,800
Total assets acquired		$ 165,000

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