v3.4.0.3

Segment Information - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) Aircraft Segment Contract Entity States Location Employees Pilot | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Number of reportable segments | Segment | 3 |
Number of aircraft operated | 100 |
Number of contracts | Contract | 0 |
Fixed revenue streams | Entity | 0 |
Hospitals Contracts [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment revenue | 31.00% | 42.00%
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 |
Remaining unpaid portion of severance costs | $ | 0.8 |
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 operated | 154 |
Segment revenue | 54.00% | 59.00%
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 |
Air Medical [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment revenue | 43.00% | 35.00%
Number of aircraft assigned | 105 |
Number of states in which company operates aircrafts | States | 19 |
Locations in which company operates Aircrafts | Location | 70 |
Air Medical [Member] | Middle East [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of aircraft operated | 5 |
Locations in which company operates Aircrafts | Location | 4 |
Number of revenue generating aircrafts | 4 |
Technical Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment revenue | 3.00% | 6.00%

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