Subsequent Event - Additional Information (Detail) - Sinomine (Hong Kong) Rare Metals Resources Co. Limited [Member] - Specialty Fluids [Member] - USD ($) $ in Millions		3 Months Ended
Jan. 30, 2019	Mar. 31, 2019
Scenario, Forecast
Subsequent Event [Line Items]
Non cash impairment charge		$ 25
Subsequent Event
Subsequent Event [Line Items]
Stock transaction value	$ 135
Purchase price	130
Additional cash royalties for lithium products	$ 5
Royalty payable term	10 years

Note received instead of cash as contribution to equity. The transaction may be a sale of capital stock or a contribution to paid-in capital.

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