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Commitment and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2012 Obligations Related To The Entity's Directors and Officers USD ($)	Dec. 31, 2012 Obligations Related To The Entity's Directors and Officers CNY	Dec. 31, 2011 Obligations Related To The Entity's Directors and Officers CNY	Dec. 31, 2012 Offices USD ($)	Dec. 31, 2012 Offices CNY	Dec. 31, 2011 Offices CNY	Dec. 31, 2010 Offices CNY	Dec. 31, 2012 IDC Facilities USD ($)	Dec. 31, 2012 IDC Facilities CNY	Dec. 31, 2011 IDC Facilities CNY	Dec. 31, 2010 IDC Facilities CNY
Commitments and Contingencies Disclosure [Line Items]
Total capital commitments contracted not yet reflected in financial statements	$ 109.34	681.21
Total operating lease expense				31.55	196.59	137.08	76.87	171.64	1,070.00	626.44	310.54
Fair value of indemnification obligations related to the entity's directors and officers	$ 0	0	0

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 3, 8, 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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No definition available.

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