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Restructuring and Related Reorganization Charges - Restructuring and Related Reorganization Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Reserve [Roll Forward]      
Beginning balance $ 18,424 $ 47,012 $ 23,775
Charges [1] 16,738 55,907 104,871
Payments (26,727) (71,374) (47,796)
Non-cash items 879 (13,121) (33,838)
Ending balance 9,314 18,424 47,012
Employee Severance and Benefits      
Restructuring Reserve [Roll Forward]      
Beginning balance 18,150 45,889 10,117
Charges 8,380 39,477 66,255
Payments (19,005) (66,442) (29,388)
Non-cash items 810 (774) (1,095)
Ending balance 8,335 18,150 45,889
Stock-based Compensation      
Restructuring Reserve [Roll Forward]      
Beginning balance 0 0 0
Charges 0 12,690 32,749
Payments 0 0 0
Non-cash items 0 (12,690) (32,749)
Ending balance 0 0 0
Other      
Restructuring Reserve [Roll Forward]      
Beginning balance 274 1,123 13,658
Charges 8,358 3,740 5,867
Payments (7,722) (4,932) (18,408)
Non-cash items 69 343 6
Ending balance $ 979 $ 274 $ 1,123
[1] (1) Includes stock-based compensation as follows: Cost of revenue$10,173 $11,388 $5,307Selling and marketing39,855 46,654 33,164Technology and content54,633 63,536 26,766General and administrative44,689 108,149 80,082Restructuring and related reorganization charges— 12,690 32,749