Segment Information - Schedule of Net Revenue Attributable to Medicaid, Medicare, Insurance, and Self-Pay as a Percentage of Net Air Medical Revenues (Detail) (Air Medical [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Insurance [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	70.00%	72.00%
Medicare [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	20.00%	20.00%
Medicaid [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	8.00%	7.00%
Self Pay [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	2.00%	1.00%