Significant Accounting Policies (Details 2)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Percentage of net service revenue
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Home Based Services [Member]
Percentage of net service revenue
Percentage of net service revenue	88.60%	88.20%	88.30%	87.90%
Facility Based Services [Member]
Percentage of net service revenue
Percentage of net service revenue	11.40%	11.80%	11.70%	12.10%