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Commitments and Contingencies - Concentration Risks and Employees Under Collective Bargaining Agreements (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Concentration Risk and Significant Customers |  |  |
Allowance for doubtful accounts | $ | $ 173,000 | $ 187,000 |
Atlantic Southeast pilots and ExpressJet Delaware pilots |  |  |
Concentration Risk and Significant Customers |  |  |
Labor agreement, contract extension term (in years) | 2 years |  |
Revenue from rights, concentration risk | Customer concentration risk | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 85.40% | 86.90% | 88.70%
Full-time equivalent number of employees |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 16,900 |  |
Full-time equivalent number of employees | Unionized employees |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 33.40% |  |
Full-time equivalent number of employees | Unionized employees | Atlantic Southeast Pilots |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 1,238 |  |
Full-time equivalent number of employees | Unionized employees | Atlantic Southeast Flight Attendants |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 833 |  |
Full-time equivalent number of employees | Unionized employees | Atlantic Southeast Flight Controllers |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 68 |  |
Full-time equivalent number of employees | Unionized employees | Atlantic Southeast Mechanics |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 366 |  |
Full-time equivalent number of employees | Unionized employees | Atlantic Southeast Stock Clerks |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 35 |  |
Full-time equivalent number of employees | Unionized employees | ExpressJet Delaware Pilots |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 1,496 |  |
Full-time equivalent number of employees | Unionized employees | ExpressJet Delaware Flight Attendants |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 783 |  |
Full-time equivalent number of employees | Unionized employees | ExpressJet Delaware Mechanics |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 730 |  |
Full-time equivalent number of employees | Unionized employees | ExpressJet Delaware Dispatchers |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 47 |  |
Full-time equivalent number of employees | Unionized employees | ExpressJet Delaware Stock Clerks |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 47 |  |

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