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Restructuring charges - Schedule of Changes in Restructuring Liability (Detail) (Severance [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Balance	$ 1,638	$ 1,826
Charges under 2010 plan		3,550
Cash payments	(1,638)	(3,738)
Balance		$ 1,638

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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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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