Litigation and Other Contingencies (Details) (Serrano lawsuit)	1 Months Ended
Sep. 30, 2010 individual
Serrano lawsuit
Loss Contingencies [Line Items]
Number of plaintiffs (individual)	13

Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration