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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, 2018 USD ($) employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Concentration Risk and Significant Customers |  |  |
Allowance for doubtful accounts | $ | $ 158,000 | $ 157,000 |
Revenue from rights, concentration risk | Customer concentration risk | Delta, United, and Continental Combined |  |  |
Concentration Risk and Significant Customers |  |  |
Concentration risk (as a percent) | 81.40% | 82.90% | 88.70%
Full-time equivalent number of employees | Labor force concentration risk |  |  |
Concentration Risk and Significant Customers |  |  |
Number of employees | 15,900 |  |
Full-time equivalent number of employees | ExpressJet | Unionized employees |  |  |
Concentration Risk and Significant Customers |  |  |
Number of full-time equivalent employees | 2,932 |  |
Approximate number of active employees | 2,320 |  |
SkyWest Airlines | Full-time equivalent number of employees | Unionized employees |  |  |
Concentration Risk and Significant Customers |  |  |
Approximate number of active employees | 0 |  |

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