Segment Information - Schedule of Net Revenue Attributable to Medicaid, Medicare, Private Insurance and Self Pay as Percentage of Net Air Medical Revenues (Detail) - Air Medical [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Insurance [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	75.00%	74.00%	72.00%	74.00%
Medicare [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	17.00%	17.00%	18.00%	17.00%
Medicaid [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	8.00%	8.00%	9.00%	8.00%
Self Pay [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	0.00%	1.00%	1.00%	1.00%