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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Insurance [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	74.00%	73.00%	73.00%	72.00%
Medicare [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	18.00%	18.00%	19.00%	19.00%
Medicaid [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	7.00%	8.00%	7.00%	8.00%
Self Pay [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	1.00%	1.00%	1.00%	1.00%