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Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0	$ 7,085	$ 0	$ 14,604
Restructuring liabilities	$ 608		$ 608		$ 10,887
2011 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Number of employees			226

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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