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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

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