Basis of Presentation (Details)	Jun. 30, 2012 Location Person
Basis of Presentation (Textual) [Abstract]
Number of Residential Clients	11,600
Number of Periodic Clients	16,700
Area of operation, Number of states	33

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant