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Restructuring Impairment Charges - Restructuring and Impairment Charges Footnote (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012 Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance and related costs		$ 2,300,000	$ 1,600,000
Severance and related costs, favorable adjustment	$ 700,000

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 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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