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Consolidated Statements of Changes in Total Equity (Parenthetical) | Dec. 31, 2011
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Statement Of Stockholders Equity [Abstract] |
Percentage of sale of ownership interest | 49.00%

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration