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Segment Information - Total Assets by Business Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Total assets $ 614,165 $ 576,612
Chemical [Member]
   
Segment Reporting Information [Line Items]    
Total assets 425,819 394,479
Climate Control [Member]
   
Segment Reporting Information [Line Items]    
Total assets 139,757 139,526
Corporate assets and other [Member]
   
Segment Reporting Information [Line Items]    
Total assets $ 48,589 $ 42,607