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Restructuring Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Percentage of staff reduced by the Corporation	3.40%
Restructuring charges	$ 539	$ 539
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	437	437
Fixed Asset Retirement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 102

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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