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Severance and Other Charges (Detail) - Severance and Other Charges Costs (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Total severance and other charges	$ 889
Employee Severance Expense [Member]
Total severance and other charges	572
Lease Termination Costs [Member]
Total severance and other charges	184
Asset impairment [Member]
Total severance and other charges	$ 133

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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