Annual report pursuant to Section 13 and 15(d)

Investments in Affiliated Companies - Ownership Percentage (Details)

v3.8.0.1
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%