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Inventories - Additional Information (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Climate Control Products [Member]    
Inventory [Line Items]    
Inventory reserves $ 1,797,000 $ 1,653,000
Chemical Products [Member]    
Inventory [Line Items]    
Inventory reserves $ 653,000 $ 1,976,000