Fair Value of Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value Measurements At Reporting Date Using Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets at fair value	$ 936,808		$ 685,904
Total assets and liabilities at fair value	936,808		685,904
Fair Value Measurements At Reporting Date Using Level 1 | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	936,438	[1]	685,707	[1]
Fair Value Measurements At Reporting Date Using Level 1 | Corporate Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	370	[2]	197	[2]
Fair Value Measurements At Reporting Date Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets at fair value	3,705,920		4,744,681
Total assets and liabilities at fair value	3,704,519		4,738,019
Fair Value Measurements At Reporting Date Using Level 2 | Government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	876,197	[1]	2,464,227	[1]
Fair Value Measurements At Reporting Date Using Level 2 | Commercial Paper And Bank Certificates Of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	472,080	[1]	892,769	[1]
Fair Value Measurements At Reporting Date Using Level 2 | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,059,159	[1]	1,298,123	[1]
Fair Value Measurements At Reporting Date Using Level 2 | Bank Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	84,443		84,555
Fair Value Measurements At Reporting Date Using Level 2 | Foreign currency derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	214,041	[3]	5,007	[3]
Foreign currency derivative contracts	(1,401)	[3]	(6,662)	[3]
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets at fair value			816,261
Total assets and liabilities at fair value			816,261
Fair Value, Inputs, Level 3 | Preference Shares | Alibaba Group
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			816,261
Fair Value Measurements At Reporting Date Using Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets at fair value	4,642,728		6,246,846
Total assets and liabilities at fair value	4,641,327		6,240,184
Fair Value Measurements At Reporting Date Using Total | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	936,438	[1]	685,707	[1]
Fair Value Measurements At Reporting Date Using Total | Government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	876,197	[1]	2,464,227	[1]
Fair Value Measurements At Reporting Date Using Total | Commercial Paper And Bank Certificates Of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	472,080	[1]	892,769	[1]
Fair Value Measurements At Reporting Date Using Total | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,059,159	[1]	1,298,123	[1]
Fair Value Measurements At Reporting Date Using Total | Bank Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	84,443		84,555
Fair Value Measurements At Reporting Date Using Total | Preference Shares | Alibaba Group
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			816,261
Fair Value Measurements At Reporting Date Using Total | Corporate Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	370	[2]	197	[2]
Fair Value Measurements At Reporting Date Using Total | Foreign currency derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	214,041	[3]	5,007	[3]
Foreign currency derivative contracts	$ (1,401)	[3]	$ (6,662)	[3]

[1] The money market funds, government and agency securities, commercial paper and bank certificates of deposit, and corporate debt securities are classified as part of either cash and cash equivalents or investments in marketable securities in the consolidated balance sheets.

[2] The corporate equity securities are classified as part of the other long-term assets and other marketable securities are classified as investments in marketable securities in the consolidated balance sheets.

[3] Foreign currency derivative contracts are classified as part of either other current assets or other current liabilities in the consolidated balance sheets. The notional amounts of the foreign currency derivative contracts were $3.4 billion, including contracts designated as net investment hedges of $3 billion, as of December 31, 2012, and $1.8 billion, including contracts designated as net investment hedges of $1.3 billion, as of December 31, 2013.