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

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

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