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Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Employee	Dec. 31, 2011 Employee
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 2,581	$ 7,519
Number of employees receiving severance benefits		114	292
Restructuring accruals	$ 2,754	$ 2,754	$ 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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