Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Restructuring charges, net	$ (8,000)				$ (4,000)		$ 7,000		$ (77,000)		$ (25,000)		$ (129,000)		$ (6,000)		$ (3,766)	$ (236,170)	$ (24,420)
Other income, net	(2,691)	[1]	5,370	[2]	23,606	[3]	17,072	[4]	17,730	[5]	4,607,656	[6]	20,175	[7]	2,278	[8]	43,357	4,647,839	27,175
Net income attributable to Yahoo! Inc.	348,190	[1]	296,656	[2]	331,150	[3]	390,285	[4]	272,267	[5]	3,160,238	[6]	226,631	[7]	286,343	[8]	1,366,281	3,945,479	1,048,827
Revenue	1,265,795	[1]	1,138,973	[2]	1,135,244	[3]	1,140,368	[4]	1,345,807	[5]	1,201,732	[6]	1,217,794	[7]	1,221,233	[8]	4,680,380	4,986,566	4,984,199
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income attributable to Yahoo! Inc.																	(2,876)	(128,098)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenue																	(2,080)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Realized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Available-for-sale securities																		9,088
Other income, net																	(796)
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Restructuring charges, net																		(16,208)
Other income, net																		(120,978)
Net income attributable to Yahoo! Inc.																		$ (137,186)

[1] Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2013 includes a gain on the sale of patents of $70 million, a goodwill impairment charge of $64 million, and net restructuring charges of $8 million.

[2] Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2013 includes net restructuring reversals of less than $1 million.

[3] Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2013 includes net restructuring charges of $4 million.

[4] Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2013 includes net restructuring reversals of $7 million.

[5] Net income attributable to Yahoo! Inc. for the quarter ended December 31, 2012 includes a one-time distribution of foreign earnings resulting in an overall net benefit of approximately $117 million and net restructuring charges of $77 million.

[6] Net income attributable to Yahoo! Inc. for the quarter ended September 30, 2012 includes net restructuring charges of $25 million and pre-tax gain of $4.6 billion related to the sale of Alibaba Group Shares, which is included in other income, net.

[7] Net income attributable to Yahoo! Inc. for the quarter ended June 30, 2012 includes net restructuring charges of $129 million.

[8] Net income attributable to Yahoo! Inc. for the quarter ended March 31, 2012 includes net restructuring charges of $6 million.