Changes in Liability and Balance Related to Restructuring Plans (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Changes in the liability and the balance related restructuring plan
Beginning balance	$ 828,000	$ 0
Restructuring charge	185,000	1,145,000
Payments	(828,000)	(317,000)
Ending balance	$ 185,000	$ 828,000

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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