Inventories - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Climate Control Products [Member]
Inventory [Line Items]
Inventory reserves	$ 1,653,000	$ 1,389,000
Chemical Products [Member]
Inventory [Line Items]
Inventory reserves	$ 1,976,000	$ 1,623,000

Amount of valuation reserve for inventory.

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