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Retirement Plans and Employee Stock Purchase Plans - Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
SkyWest Plan |  |  |
Retirement Plans |  |  |
Service period required to be completed to be eligible to participate in plan | 90 days |  |
Required age for an employee to be eligible to participate in plan | 18 years |  |
Percentage of employer matching contribution based on length of service | 100.00% |  |
Company's combined contributions | $ 23.2 | $ 20.4 | $ 19.3
SkyWest Plan | Pilot employees |  |  |
Retirement Plans |  |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold one | 2.00% |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold two | 4.00% |  |
Percentage of participant compensation eligible for employer's matching contribution based upon length of service, threshold three | 6.00% |  |
SkyWest Plan | Non-pilot employees |  |  |
Retirement Plans |  |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold one | 3.00% |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold two | 5.00% |  |
Percentage of participant compensation eligible for employer's matching contribution based upon length of service, threshold three | 7.00% |  |
Atlantic Southeast and the ExpressJet Plans |  |  |
Retirement Plans |  |  |
Service period required to be completed to be eligible to participate in plan | 90 days |  |
Required age for an employee to be eligible to participate in plan | 18 years |  |
Company's combined contributions | $ 21.0 | $ 24.0 | $ 27.2
Atlantic Southeast Plan |  |  |
Retirement Plans |  |  |
Maximum percentage of participant's total compensation eligible for employer matching contribution | 6.00% |  |
Minimum service period required to be completed for eight percent matching contribution by the employer | 10 years |  |
Maximum percentage of participant's total compensation eligible for employer matching contribution after requisite service period | 8.00% |  |
Percentage of vesting for plan participants' elective deferrals and rollover amounts | 100.00% |  |
Atlantic Southeast Plan | Minimum |  |  |
Retirement Plans |  |  |
Percentage of employer matching contribution based on length of service | 20.00% |  |
Percentage of vesting of company matching contribution based on length of service | 10.00% |  |
Atlantic Southeast Plan | Maximum |  |  |
Retirement Plans |  |  |
Percentage of employer matching contribution based on length of service | 75.00% |  |
Percentage of vesting of company matching contribution based on length of service | 100.00% |  |

X
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- Definition Represents the maximum percentage of participant total compensation eligible for employer matching contribution after requisite service period. + References No definition available. + Details
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- Definition Represents the minimum service period required for Maximum employer matching contribution. + References No definition available. + Details
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- Definition Represents the third threshold percentage of the participant's compensation eligible for the employer's matching contribution based upon the length of service. + References No definition available. + Details
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- Definition Represents the second threshold percentage of the participant's compensation eligible for the employer's matching contribution based upon the length of service. + References No definition available. + Details
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- Definition Represents the age required to be completed by the employee to be eligible to participate in the plan. + References No definition available. + Details
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- Definition Represents the percentage of vesting for plan participants in their elective deferrals and rollover amounts. + References No definition available. + Details
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