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Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Employee	Sep. 30, 2011	Dec. 31, 2011 Employee
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 7,085	$ 2,931	$ 14,604	$ 2,931
Number of employees receiving severance benefits			226		292
Restructuring liabilities	$ 5,628		$ 5,628		$ 5,875

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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