Restructuring and Related Reorganization Charges - Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning balance			$ 47,012		$ 23,775
Charges	$ 23,000	$ 26,000	55,907	[1]	104,871	[1]	$ 25,630	[1]
Payments			(71,374)		(47,796)
Non-cash items			(13,121)		(33,838)
Ending balance	47,012	23,775	18,424		47,012		23,775
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Beginning balance			45,889		10,117
Charges			39,477		66,255
Payments			(66,442)		(29,388)
Non-cash items			(774)		(1,095)
Ending balance	45,889	10,117	18,150		45,889		10,117
Stock-based Compensation
Restructuring Reserve [Roll Forward]
Beginning balance			0		0
Charges			12,690		32,749
Payments			0		0
Non-cash items			(12,690)		(32,749)
Ending balance	0	0	0		0		0
Other
Restructuring Reserve [Roll Forward]
Beginning balance			1,123		13,658
Charges			3,740		5,867
Payments			(4,932)		(18,408)
Non-cash items			343		6
Ending balance	$ 1,123	$ 13,658	$ 274		$ 1,123		$ 13,658

[1] (1) Includes stock-based compensation as follows: Cost of revenue$11,388 $5,307 $3,921Selling and marketing46,654 33,164 18,067Technology and content63,536 26,766 22,100General and administrative108,149 80,082 40,923Restructuring and related reorganization charges12,690 32,749 —