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Schedule of Restructuring Accruals Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Balance at January 1, 2012		$ 5,875
Restructuring expenses	2,581	7,519
Payments/utilization		(10,640)
Balance at June 30, 2012	$ 2,754	$ 2,754

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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