Total Share-Based Compensation Cost Recognized (Detail) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012 USD ($)	Sep. 30, 2012 CNY	Sep. 30, 2011 CNY	Sep. 30, 2012 Cost of Sales USD ($)	Sep. 30, 2012 Cost of Sales CNY	Sep. 30, 2011 Cost of Sales CNY	Sep. 30, 2012 Selling, General and Administrative Expense USD ($)	Sep. 30, 2012 Selling, General and Administrative Expense CNY	Sep. 30, 2011 Selling, General and Administrative Expense CNY	Sep. 30, 2012 Research and Development Expense USD ($)	Sep. 30, 2012 Research and Development Expense CNY	Sep. 30, 2011 Research and Development Expense CNY
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 23,190	145,743	105,387	$ 913	5,741	5,359	$ 7,970	50,088	35,899	$ 14,307	89,914	64,129

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration