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Retirement Plans and Employee Stock Purchase Plans (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2007 | Nov. 30, 2007 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
ExpressJet Plan |  |  |  |  |
Minimum period of service required to be completed by retired employees for availing medical bridge coverage |  |  | 10 years |  |
Mandatory retirement age for commercial pilots | 65 years | 60 years |  |  |
Minimum |  |  |  |  |
ExpressJet Plan |  |  |  |  |
Eligible age to provide medical bridge coverage |  |  | 60 years |  |
Maximum |  |  |  |  |
ExpressJet Plan |  |  |  |  |
Eligible age to provide medical bridge coverage |  |  | 65 years |  |
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%skyw_DefinedBenefitPlanPercentageOfEmployerMatchingContributionForParticipantContributionsBasedUponLengthOfService / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold one |  |  | 2.00%skyw_DefinedBenefitPlanPercentageOfParticipantsCompensationEligibleForEmployerMatchingContributionBasedUponLengthOfServiceThresholdOne / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember |  |
Percentage of participant's compensation eligible for employer's matching contribution based upon length of service, threshold two |  |  | 4.00%skyw_DefinedBenefitPlanPercentageOfParticipantsCompensationEligibleForEmployerMatchingContributionBasedUponLengthOfServiceThresholdTwo / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember |  |
Percentage of participant compensation eligible for employer's matching contribution based upon length of service, threshold three |  |  | 6.00%skyw_DefinedBenefitPlanPercentageOfParticipantsCompensationEligibleForEmployerMatchingContributionBasedUponLengthOfServiceThresholdThree / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember |  |
Company's combined contributions |  |  | 19.3 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember | $ 18.3 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember | $ 16.0 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_SkyWestIncEmployeesRetirementPlanMember
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 |  |  | 27.2 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAndExpressJetRetirementPlansMember | $ 26.7 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAndExpressJetRetirementPlansMember | $ 26.4 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAndExpressJetRetirementPlansMember
Atlantic Southeast Plan |  |  |  |  |
Retirement Plans |  |  |  |  |
Maximum percentage of participant's total compensation eligible for employer matching contribution |  |  | 6.00%skyw_DefinedBenefitPlanMaximumPercentageOfParticipantTotalCompensationEligibleForEmployerMatchingContribution / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember |  |
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%skyw_DefinedBenefitPlanMaximumPercentageOfParticipantTotalCompensationEligibleForEmployerMatchingContributionAfterRequisiteServicePeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember |  |
Percentage of vesting for plan participants' elective deferrals and rollover amounts |  |  | 100.00%skyw_DefinedBenefitPlanVestingPercentageForElectiveDeferralsAndRolloverAmounts / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember |  |
Atlantic Southeast Plan | Minimum |  |  |  |  |
Retirement Plans |  |  |  |  |
Percentage of employer matching contribution based on length of service |  |  | 20.00%skyw_DefinedBenefitPlanPercentageOfEmployerMatchingContributionForParticipantContributionsBasedUponLengthOfService / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Percentage of vesting of company matching contribution based on length of service |  |  | 10.00%skyw_DefinedBenefitPlanVestingPercentageForEmployerMatchingContributionsBasedOnLengthOfService / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Atlantic Southeast Plan | Maximum |  |  |  |  |
Retirement Plans |  |  |  |  |
Percentage of employer matching contribution based on length of service |  |  | 75.00%skyw_DefinedBenefitPlanPercentageOfEmployerMatchingContributionForParticipantContributionsBasedUponLengthOfService / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Percentage of vesting of company matching contribution based on length of service |  |  | 100.00%skyw_DefinedBenefitPlanVestingPercentageForEmployerMatchingContributionsBasedOnLengthOfService / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = skyw_AtlanticSoutheastAirlinesIncInvestmentSavingsPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Represents the mandatory retirement age for commercial pilots. + References No definition available. + Details
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- Definition Represents the eligible age for which medical bridge coverage is provided by the entity to the employees. + References No definition available. + Details
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- Definition Represents the maximum percentage of the participant's compensation eligible for the employer matching contribution. + References No definition available. + Details
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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 maximum percentage of the employer's matching contribution for participant contributions based upon the length of service. + References No definition available. + Details
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- Definition Represents the first 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 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 Description of the estimated period of time over which an employee is required to provide service to participate in the defined benefit 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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- Definition Represents the percentage of vesting of company matching contribution for plan participants based on the length of service. + References No definition available. + Details
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- Definition Represents the minimum period of service required to be completed by retired employees for availing medical bridge coverage provided by the entity. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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