Segment Information - Schedule of Net Revenue Attributable to Insurance, Medicare, Medicaid, and Self-Pay as Percentage of Net Air Medical Revenues (Detail) - Air Medical [Member] |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Insurance [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 73.00% | 75.00% | 72.00% | 72.00% |
| Medicare [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 17.00% | 17.00% | 18.00% | 18.00% |
| Medicaid [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 9.00% | 8.00% | 9.00% | 9.00% |
| Self Pay [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 1.00% | 0.00% | 1.00% | 1.00% |