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Segment Revenues and Segment Income (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Expense for incentive compensation plans	$ 25,200,000	$ 65,000,000	$ 108,100,000
Share-based compensation expense	51,993,000us-gaap_ShareBasedCompensation	61,651,000us-gaap_ShareBasedCompensation	63,277,000us-gaap_ShareBasedCompensation
Corporate and Other
Segment Reporting Information [Line Items]
Expense for incentive compensation plans	25,200,000	65,000,000	108,100,000
Severance and other termination-related costs	51,800,000	17,600,000	13,400,000
Share-based compensation expense	52,000,000	61,700,000	63,300,000
Litigation charge			$ 137,800,000

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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