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Equity Investees (Tables)
12 Months Ended
Dec. 31, 2011
Equity Investees [Abstract]  
Equity method investments in and advances to affiliates and joint ventures
     Ownership
Interest
 

Ashapura Volclay Limited

    50%   

CETCO-Bentonit Uniao Technologias Ambientais Ltda.

    50%   

Egypt Mining & Drilling Co. and Egypt Bentonite & Derivatives 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%