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Investments in Affiliated Companies - Ownership Percentage (Details)	Dec. 31, 2017
PQ Silicates Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Zeolyst International
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Zeolyst C.V.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Quaker Holdings
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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