Acquisitions and Joint Venture - Purchase Price (Details) - Lynda.com Inc [Member] $ in Thousands	May. 14, 2015 USD ($)
Business Acquisition [Line Items]
Cash	$ 777,745
Earned portion of the assumed stock options	11,181
Other consideration	2,758
Purchase consideration	1,486,712
Class A Common Stock [Member]
Business Acquisition [Line Items]
Class A common stock	$ 695,028

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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