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Operating Segments and Geographic Area Information - Goodwill and Identifiable Assets by Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Identifiable assets: $ 3,584,797 $ 3,437,291 $ 3,203,824
Goodwill 284,203 276,966 273,145
Performance Chemicals
      
Segment Reporting Information [Line Items]      
Identifiable assets: 1,129,838 1,110,006 1,011,144
Goodwill 43,603 43,519 43,098
Catalyst Solutions
      
Segment Reporting Information [Line Items]      
Identifiable assets: 1,695,120 1,572,883 1,502,984
Goodwill 240,600 233,447 230,047
Corporate & other
      
Segment Reporting Information [Line Items]      
Identifiable assets: $ 759,839 $ 754,402 $ 689,696