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 | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Insurance [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 72.00% | 69.00% | 71.00% | 70.00% |
| Medicare [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 18.00% | 18.00% | 18.00% | 18.00% |
| Medicaid [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 8.00% | 9.00% | 9.00% | 10.00% |
| Self Pay [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Percentage of net Air Medical revenues | 2.00% | 4.00% | 2.00% | 2.00% |