Restructuring and Related Reorganization Charges - Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Accrued liability Beginning Balance				$ 47,012
Charges	[1]	$ 6,638	$ 71,679	46,274	$ 82,001
Payments				(58,710)
Non-cash items				(12,342)
Accrued liability Ending Balance		22,234		22,234
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrued liability Beginning Balance				45,889
Charges				30,265
Payments				(54,538)
Non-cash items				5
Accrued liability Ending Balance		21,621		21,621
Stock-based Compensation
Restructuring Reserve [Roll Forward]
Accrued liability Beginning Balance				0
Charges				12,690
Payments				0
Non-cash items				(12,690)
Accrued liability Ending Balance		0		0
Other
Restructuring Reserve [Roll Forward]
Accrued liability Beginning Balance				1,123
Charges				3,319
Payments				(4,172)
Non-cash items				343
Accrued liability Ending Balance		$ 613		$ 613

[1] Includes stock-based compensation as follows: Cost of revenue $3,476 thousand, $1,112 thousand, $8,768 thousand, and $3,586 thousand; Selling and marketing $4,876 thousand, $10,558 thousand, $37,372 thousand, and $23,890 thousand; Technology and content $11,556 thousand, $7,062 thousand, $50,997 thousand, and $19,405 thousand; General and administrative $27,308 thousand, $15,694 thousand, $87,775 thousand, and $57,925 thousand; Restructuring and related reorganization charges $1,047 thousand, $29,230 thousand, $12,690 thousand, and