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Summary of Redeemable Noncontrolling Interest (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY
Redeemable Noncontrolling Interest [Line Items] |  |  |  |
Balance at December 31, 2010 | $ 0 |  | 0 |
Acquisition of Qunar | 149,669 |  | 942,004 |
Equity issuance of subsidiaries | 518 | [1] | 3,261 | [1]
Current losses | (1,634) |  | (10,284) |
Other comprehensive loss | (158) |  | (995) |
Share-based compensation | 317 |  | 1,992 |
Balance at December 31, 2011 | $ 148,712 |  | 935,978 |
[1] | In December 2011, NTT DOCOMO, Inc. ("DCM") subscribed with cash new ordinary shares of B.D. Mobile representing 6.98% of its equity interest. The newly issued ordinary shares could be redeemed upon occurrence of certain events that are not solely within the control of B.D. Mobile and are accounted for as redeemable noncontrolling interests.

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- Definition Increase in redeemable noncontrolling interest balance because of a business combination that occurred during the period. + References No definition available. + Details
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- Definition The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-98 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph i Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph a -Article 5 + Details
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- Definition Adjustments to temporary equity resulting from foreign currency translation adjustments. + References No definition available. + Details
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- Definition The portion of net income or loss attributable to temporary equity interest. + References No definition available. + Details
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