Significant Payors (Details) (State Governmental Agency [Member])	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2014 Service Revenues, Net [Member]	Sep. 30, 2013 Service Revenues, Net [Member]	Sep. 30, 2014 Service Revenues, Net [Member]	Sep. 30, 2013 Service Revenues, Net [Member]	Sep. 30, 2014 Accounts Receivable [Member]	Dec. 31, 2013 Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	52.10%	58.90%	53.70%	59.10%	59.10%	65.60%