SEGMENT INFORMATION - Schedule of Net Revenue Attributable to Medicaid, Medicare, Insurance, and Self-Pay as a Percentage of Net Air Medical Revenues (Detail) (Reportable operating segments [Member], Air Medical [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Insurance [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	73.00%	61.00%	72.00%	60.00%
Medicare [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	18.00%	22.00%	19.00%	24.00%
Medicaid [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	8.00%	16.00%	8.00%	15.00%
Self-Pay [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	1.00%	1.00%	1.00%	1.00%