Basis of Presentation (Details)	Sep. 30, 2013 Centers
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	6
Consolidated [Member]
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	3
Nonconsolidated [Member]
Ownership Interests [Line Items]
Number Of Centers Owned Less Than 51 Percent	3