Acquisitions and Joint Venture - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Lynda.com Inc [Member]
Business Acquisition [Line Items]
Pro forma revenue	$ 3,073,039	$ 2,356,620
Pro forma, net loss attributable to common stockholders	$ (176,894)	$ (173,461)
Pro forma, net loss per share attributable to common stockholders - diluted (in dollars per share)	$ (1.36)	$ (1.37)
Bright and Bizo
Business Acquisition [Line Items]
Pro forma revenue	$ 2,247,187	$ (1,574,460)
Pro forma, net loss attributable to common stockholders	$ (50,786)	$ (9,007)
Pro forma, net loss per share attributable to common stockholders - diluted (in dollars per share)	$ (0.41)	$ 0.08

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.

No definition available.

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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