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Discontinued operations - Schedule of Cumulative Gain on Disposal Activity (Parenthetical) (Detail) (Zhejiang Continental [Member]) | 12 Months Ended
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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. + References No definition available. + Details
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