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Segment Information - Total Assets by Business Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Total assets $ 1,178,179 $ 1,137,005
Operating Segments [Member] | Chemical [Member]    
Segment Reporting Information [Line Items]    
Total assets 980,064 929,745
Operating Segments [Member] | Climate Control [Member]    
Segment Reporting Information [Line Items]    
Total assets 136,767 133,183
Operating Segments [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Total assets 6,409 5,960
Corporate [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 54,939 $ 68,117