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Segment Revenues and Segment Income (Parenthetical) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Share-based compensation expense	$ 12,693,000	$ 13,862,000
Corporate and Other
Segment Reporting Information [Line Items]
Severance expense	21,500,000	5,500,000
Share-based compensation expense	$ 12,700,000	$ 13,900,000

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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