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Note Receivable (Details) (Receivables related to United Express Agreement, SkyWest Airlines, USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 16, 2009 D | Dec. 31, 2012 D | Dec. 31, 2011 D
Receivables related to United Express Agreement | SkyWest Airlines |  |  |
Loan provided by subsidiary to United |  |  |
Deferral period, maximum (in days) | 30 |  |
Deferral amount, maximum |  | $ 49 | $ 49
Deferral fee (as a percent) |  | 8.00% |
Amount of loan deferred and classified as current |  | $ 49.0 |
Deferred period (in days) |  | 30 | 30

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- Definition The maximum amount of the receivable that may be deferred per the agreement. + References No definition available. + Details
Name: | skyw_AccountsNotesAndLoansReceivableDeferralAmountMaximum
Namespace Prefix: | skyw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Related to receivables, the deferral fee percentage rate stated in the agreement. + References No definition available. + Details
Name: | skyw_AccountsNotesAndLoansReceivableDeferralFeePercentage
Namespace Prefix: | skyw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum period for which payments on the receivable may be deferred per the agreement. + References No definition available. + Details
Name: | skyw_AccountsNotesAndLoansReceivableDeferralPeriodMaximum
Namespace Prefix: | skyw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The period for which the receivable is deferred. + References No definition available. + Details
Name: | skyw_AccountsNotesAndLoansReceivableDeferredPeriod
Namespace Prefix: | skyw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccountsReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant