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Segment Revenues and Segment Income (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Share-based compensation expense	$ 15,687	$ 11,779	$ 27,290	$ 24,472
Corporate and Other
Segment Reporting Information [Line Items]
Severance and other termination-related costs	15,600	12,600	43,600	34,100
Share-based compensation expense	$ 15,700	$ 11,800	$ 27,300	$ 24,500

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 420



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SAB TOPIC 5.P.4(b))



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-Publisher FASB



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-Publisher FASB



-Name Accounting Standards Codification



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-Publisher SEC



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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 28



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