v3.5.0.2

Segment Information - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 USD ($) Employees Pilot | Sep. 30, 2015 | Sep. 30, 2016 Aircraft Segment Location States Entity | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  |  | 3 |
Hospitals Contracts [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenue | 27.00% |  | 34.00% | 29.00% | 37.00%
Voluntary Employee Retirement Package [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Qualifying age |  |  |  | 64 years |
Number of employees accepted VERP | Employees |  | 15 |  |  |
Severance costs | $ |  | $ 1.6 |  |  |
Voluntary Furlough Program to Oil and Gas Pilots [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance costs | $ |  | $ 0.4 |  |  |
Number of employees accepted furlough program | Pilot |  | 26 |  |  |
Guaranteed period to recall under program |  | 12 months |  |  |
Oil and Gas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of aircraft available for use |  |  |  | 139 |
Segment revenue | 49.00% |  | 56.00% | 51.00% | 57.00%
Oil and Gas [Member] | Minimum [Member] | Major Customer [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Working period with major customers |  |  |  | 30 years |
Oil and Gas [Member] | Minimum [Member] | ENI Petroleum [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Working period with major customers |  |  |  | 15 years |
Technical Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenue | 4.00% |  | 4.00% | 4.00% | 4.00%
Air Medical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenue | 47.00% |  | 40.00% | 45.00% | 37.00%
Number of aircraft assigned |  |  |  | 104 |
Number of aircraft operated |  |  |  | 97 |
Number of states in which company operates aircrafts | States |  |  |  | 18 |
Locations in which company operates Aircrafts | Location |  |  |  | 72 |
Fixed revenue streams | Entity |  |  |  | 0 |
Air Medical [Member] | Middle East [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of aircraft operated |  |  |  | 8 |
Locations in which company operates Aircrafts | Location |  |  |  | 3 |
Number of revenue generating aircrafts |  |  |  | 4 |

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