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Nature of Operations and Summary of Significant Accounting Policies - Passenger and Ground Handling Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ExpressJet United Express ERJ Agreement and ExpressJet American ERJ145 Agreement |  |  |
Other Revenue Items |  |  |
Deemed rental income under code-share agreement | $ 572.7 | $ 516.0 | $ 504.9

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- Definition Represents the deemed rental income under the entity's code-share agreements, which is recorded as passenger revenue. + References No definition available. + Details
Name: | skyw_DeemedRentalIncomeUnderCodeShareAgreements
Namespace Prefix: | skyw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | skyw_OtherRevenueItemsAbstract
Namespace Prefix: | skyw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=skyw_ExpressjetUnitedExpressErjAgreementAndExpressjetAmericanErj145AgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |