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Equity Investees (Tables)
12 Months Ended
Dec. 31, 2012
Equity Investees [Abstract]  
Investments in and advances to affiliates and joint ventures
Information about our investments in and advances to affiliates and joint ventures at December 31, 2012 is as follows:

   
Ownership Interest
 
Ashapura Volclay Limited
  50%
CETCO-Bentonit Uniao Technologias Ambientais Ltda.
  50%
Egypt Bentonite & Derivatives Co.
  30%
Egypt Mining & Drilling Co.
  31%
Egypt Nano Technologies Co.
  27%
Maprid Tech Cast, S.A. de C.V.
  49%
Volclay de Mexico, S.A. de C.V.
  49%
Volclay Japan Co., Ltd.
  50%