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Restructuring and Severance - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Unpaid severance and related charges	$ 0.6
Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and severance charges	$ 1.6	$ 2.0	$ 1.6

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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