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Discontinued operations - Schedule of Cumulative Gain on Disposal Activity (Parenthetical) (Detail) (Zhejiang Continental [Member])	12 Months Ended
	Dec. 31, 2012
Zhejiang Continental [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration on disposal, shares issued	1,000,000

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- Definition

Number of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed.

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