The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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+ Details

Inventories - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Type Of Inventory [Line Items]
Inventory reserves	$ 2,506,000	$ 2,793,000	$ 1,705,000	$ 1,783,000
Climate Control products [Member]
Type Of Inventory [Line Items]
Inventory reserves	1,876,000	1,818,000
Chemical Products [Member]
Type Of Inventory [Line Items]
Inventory reserves	$ 630,000	$ 975,000