Summary of Significant Accounting Policies (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provisions For Contractual Discounts And Estimated Uncompensated Care [Abstract]
Gross billings	100.00%	100.00%
Provision for contractual discounts	38.00%	36.00%
Air Medical [Member]
Provisions For Contractual Discounts And Estimated Uncompensated Care [Abstract]
Gross billings	100.00%	100.00%	100.00%
Provision for contractual discounts	56.00%	54.00%	52.00%
Provision for uncompensated care	11.00%	11.00%	11.00%