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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: 1,132,870 1,113,038 1,014,176
Goodwill 46,635 46,551 46,130
Catalyst Solutions
      
Segment Reporting Information [Line Items]      
Identifiable assets: 1,692,088 1,569,851 1,499,952
Goodwill 237,568 230,415 227,015
Corporate & other
      
Segment Reporting Information [Line Items]      
Identifiable assets: $ 759,839 $ 754,402 $ 689,696