Consolidated Statements of Changes in Equity (Parenthetical)	Dec. 31, 2012
Statements Of Stockholders' Equity [Abstract]
Percentage of investment on Qingyuan Tanke Bio-Technology	60.00%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant