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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Insurance [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	69.00%	74.00%	70.00%	73.00%
Medicare [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	18.00%	17.00%	18.00%	17.00%
Medicaid [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	9.00%	7.00%	10.00%	8.00%
Self Pay [Member]
Segment Reporting Information [Line Items]
Percentage of net Air Medical revenues	4.00%	2.00%	2.00%	2.00%