Translation of Amounts from RMB US dollar (Detail)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Reporting Currency [Line Items]
Period end RMB : USD exchange rate	6.1364	6.3011	6.3340
Average RMB : USD exchange rate	6.2132	6.3034	6.3275

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

Name:	us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant