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Amortization Expense (Detail) (USD $)	3 Months Ended		6 Months Ended
Amortization Expense (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 152,000	$ 115,000	$ 259,000	$ 230,000
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Amortization expense	20,000	20,000	40,000	39,000
Trademarks, Patents and Copyrights
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 132,000	$ 95,000	$ 219,000	$ 191,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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