Acquisitions - Additional Information (Detail) (USD $)	12 Months Ended				0 Months Ended		0 Months Ended	12 Months Ended			12 Months Ended	0 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Maximum	Dec. 14, 2011 Interclick	Dec. 31, 2011 Interclick	Dec. 14, 2011 Interclick Maximum	Dec. 31, 2013 Other Acquisitions Entity	Dec. 31, 2011 Other Acquisitions Entity	Dec. 31, 2013 Other Acquisitions In Process Research and Development	Dec. 31, 2012 All Acquisitions Business Combinations Entity	Jun. 19, 2013 Tumblr	Dec. 31, 2013 Tumblr	Jun. 19, 2013 Tumblr Maximum	Jun. 19, 2013 Tumblr Unvested Stock Options and Restricted Stock Units	Jun. 19, 2013 Tumblr Common Stock
Business Acquisition [Line Items]
Purchase price per share					$ 9.00
Business combination, total purchase price					$ 258,501,000			$ 279,000,000	$ 72,000,000		$ 7,000,000	$ 990,211,000
Value of stock-based awards issued in connection with acquisition					9,000,000
Maximum award vesting period, in years				4 years	4 years							4 years
Useful life of amortizable intangible assets				8 years			6 years							6 years
Weighted average useful life of amortizable intangible assets					5 years							6 years
Goodwill	4,679,648,000	3,826,749,000	3,900,752,000		171,641,000	171,641,000		186,000,000	49,000,000		5,000,000	751,765,000	751,765,000
Business combination, number of entities acquired								25	3		2
Business combination, cash consideration paid								279,000,000	72,000,000		7,000,000
Business combination, cash acquired								2,000,000	3,000,000		1,000,000
Business combination, cash consideration paid net of cash acquired	1,247,544,000	5,716,000	323,830,000					277,000,000	69,000,000		6,000,000
Business combination, amortizable intangible assets								76,000,000	26,000,000	19,000,000
Business combination, cash acquired					4,369,000				3,000,000		1,000,000
Business combination, net assumed liabilities					68,120,000			37,000,000	6,000,000			114,521,000
Business combination, other tangible assets					71,711,000			33,000,000			1,000,000	73,780,000
Stock-based compensation expense	278,220,000	224,365,000	203,958,000									70,000,000
Stock based compensation contingently issuable															29,000,000	41,000,000
Contingent cash compensation to be paid to Tumblr's founder												$ 40,000,000
Contingent cash consideration, payment period												4 years