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Summary of Termination Benefit Obligations (Detail) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 64	$ 529
Termination benefits accrued		867
Cash payments	$ (64)	$ (1,396)

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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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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