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Segment Revenues and Segment Income (Parenthetical) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Share-based compensation expense	$ 11,779,000	$ 13,719,000	$ 24,472,000	$ 27,581,000
Corporate and Other
Segment Reporting Information [Line Items]
Severance expense	12,600,000	8,000,000	34,100,000	13,500,000
Share-based compensation expense	$ 11,800,000	$ 13,700,000	$ 24,500,000	$ 27,600,000

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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