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Restructuring and Related Reorganization Charges - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and related reorganization charges	$ 25,630,000us-gaap_RestructuringCharges	$ 25,630,000us-gaap_RestructuringCharges
Minimum
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges	10,000,000	10,000,000
Maximum
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges	$ 15,000,000	$ 15,000,000

- 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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