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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Severance and related costs	$ 2.5
Accrual for severance and related charges	5.5	7.5
Long term amount	1.9	2.7
Accrued retention bonuses	1.5	0.3
Gross remaining lease obligations	$ 77.0

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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