Income Taxes - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended						12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 State Research Tax Credit Carryforward	Dec. 31, 2013 Federal	Dec. 31, 2013 State	Dec. 31, 2013 Federal And State Jurisdiction	Sep. 18, 2012 Alibaba Group	Dec. 31, 2012 Alibaba Group
Income Taxes [Line Items]
Net operating loss carryforwards						$ 299,000,000	$ 31,000,000
Start of expiration of operating loss carryforwards								2021
Tax credit carryforwards					177,000,000
Start of expiration of tax credit carryforwards					Carried forward indefinitely
Valuation allowance	51,503,000	36,690,000	51,503,000
Net tax benefit from one-time distribution of earnings from consolidated foreign subsidiaries	117,000,000	36,000,000	117,000,000
Undistributed earnings of foreign subsidiaries		2,600,000,000
Unrecognized tax benefits	727,367,000	695,285,000	727,367,000	532,862,000
Amount of unrecognized tax benefits which would affect the effective tax rate if realized		466,000,000
Interest and penalties expense		21,000,000	37,000,000	2,000,000
Accrued interest and penalties	51,000,000	76,000,000	51,000,000
Interest received		4,000,000
Settlement income tax examination for the 2005 and 2006 returns, tax benefit		54,000,000
Reduction of tax reserves due to income tax examination		24,000,000
Sale of investments in equity interests, shares									523	523
Capital gain, tax percentage										10.00%
Indirect tax assessed, not accrued	$ 85,000,000		$ 85,000,000