Provision For Income Tax (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
Current:
United States federal																	$ 138,032	$ 2,278,759	$ 141,922
State																	49,872	361,788	(11,037)
Foreign																	49,790	68,816	40,490
Total current provision for income taxes																	237,694	2,709,363	171,375
Deferred:
United States federal																	(63,166)	(741,628)	77,012
State																	(22,498)	(29,470)	(4,437)
Foreign																	1,362	1,778	(2,183)
Total deferred provision (benefit) for income taxes																	(84,302)	(769,320)	70,392
Provision for income taxes	$ 41,498	[1]	$ 31,891	[2]	$ 50,267	[3]	$ 29,736	[4]	$ 83,007	[5]	$ 1,774,094	[6]	$ 26,523	[7]	$ 56,419	[8]	$ 153,392	$ 1,940,043	$ 241,767

[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.