Investment and Fair Value Measurements - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	May 16, 2013	Dec. 31, 2013	Dec. 31, 2012
Cash And Cash Equivalents And Investments [Line Items]
Proceeds related to the redemption of Alibaba Group Preference Shares		$ 800,000,000
Dividend income related to Preference Shares		35,726,000	20,000,000
Cash deposited with commercial banks		569,000,000	597,000,000
Convertible Senior Notes
Cash And Cash Equivalents And Investments [Line Items]
Principal amount		1,437,500,000
Convertible senior notes percent		0.00%
Maturity year of convertible senior notes		2018
Fair Value Measurements At Reporting Date Using Level 2 | Convertible Senior Notes
Cash And Cash Equivalents And Investments [Line Items]
Fair value of the convertible senior notes		1,111,473,000
Alibaba Group
Cash And Cash Equivalents And Investments [Line Items]
Accrued dividend income			16,000,000
Proceeds related to the redemption of Alibaba Group Preference Shares and dividends	846,000,000
Proceeds related to the redemption of Alibaba Group Preference Shares	800,000,000
Cash dividend received related to Preference Shares	46,000,000
Dividend income related to Preference Shares		36,000,000	23,000,000
Alibaba Group | Prepaid Expense And Other Assets Current
Cash And Cash Equivalents And Investments [Line Items]
Accrued dividend income			6,000,000
Alibaba Group | Redeemable Preferred Stock
Cash And Cash Equivalents And Investments [Line Items]
Fair Value Amount			822,000,000
Carrying Value Amount			$ 822,000,000