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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 aircraft | Dec. 31, 2020 USD ($) employee aircraft | Dec. 31, 2019 USD ($) | Dec. 31, 2018
Concentration Risk and Significant Customers |  |  |  |
Accrued workers' compensation liability | $ |  | $ 20.7 | $ 23.9 |
E175 |  |  |  |
Concentration Risk and Significant Customers |  |  |  |
Commitment to purchase number of aircraft | aircraft |  | 20 |  |
CRJ 700 | Subsequent event |  |  |  |
Concentration Risk and Significant Customers |  |  |  |
Commitment to purchase number of aircraft | aircraft | 12 |  |  |
Revenue from rights, concentration risk | Customer concentration risk | Delta, United, and Continental Combined |  |  |  |
Concentration Risk and Significant Customers |  |  |  |
Concentration risk (as a percent) |  | 76.40% | 77.60% | 81.40%
Full-time equivalent number of employees | Labor force concentration risk |  |  |  |
Concentration Risk and Significant Customers |  |  |  |
Number of employees | employee |  | 12,502 |  |
SkyWest Airlines | Full-time equivalent number of employees | Unionized employees |  |  |  |
Concentration Risk and Significant Customers |  |  |  |
Approximate number of active employees | employee |  | 0 |  |

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