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Segment Revenues and Segment Income (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Share-based compensation expense	$ 12,038,000	$ 19,632,000	$ 36,510,000	$ 47,213,000
Corporate and Other
Segment Reporting Information [Line Items]
Severance expense	5,000,000	2,400,000	39,100,000	15,900,000
Share-based compensation expense	$ 12,000,000	$ 19,600,000	$ 36,500,000	$ 47,200,000

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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