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Restructuring Charges - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reorganization Items [Line Items]
Restructuring charges	$ 7,565,000	$ 5,490,000	$ 16,396,000
Expected restructuring charges	12,000,000
Restructuring Charges [Member]
Reorganization Items [Line Items]
Restructuring liability	$ 3,400,000

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

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- Definition

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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