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Inventories - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Inventories - Additional Information (Detail) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 NABCO Inventories	Dec. 31, 2011 NABCO Inventories
Inventory Disclosure [Line Items]
Valuation adjustments for obsolete, damaged and slow-moving inventory	$ 15,000	$ 0.0	$ 100,000	$ 0.0
Assets pledged as collateral					$ 8,200,000	$ 7,800,000

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

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