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Retirement Plans and Employee Stock Purchase Plans (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Dec. 31, 2007 Y | Nov. 30, 2007 Y | Dec. 31, 2012 Y | Dec. 31, 2012 Minimum Y | Dec. 31, 2012 Maximum Y | Dec. 31, 2012 SkyWest Plan Y D | Dec. 31, 2011 SkyWest Plan | Dec. 31, 2010 SkyWest Plan | Dec. 31, 2012 Atlantic Southeast and the ExpressJet Plans | Dec. 31, 2011 Atlantic Southeast and the ExpressJet Plans | Dec. 31, 2010 Atlantic Southeast and the ExpressJet Plans | Dec. 31, 2012 Atlantic Southeast Plan Y D | Dec. 31, 2012 Atlantic Southeast Plan Minimum | Dec. 31, 2012 Atlantic Southeast Plan Maximum
Retirement Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service period required to be completed to be eligible to participate in plan (in days) |  |  |  |  |  | 90 |  |  |  |  |  | 90 |  |
Required age for an employee to be eligible to participate in plan (in years) |  |  |  |  |  | 18 |  |  |  |  |  | 18 |  |
Percentage of employer matching contribution based on length of service |  |  |  |  |  | 100.00% |  |  |  |  |  |  | 20.00% | 75.00%
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% |  |  |  |  |  |  |  |
Company's combined contributions |  |  |  |  |  | $ 16.0 | $ 14.4 | $ 13.3 | $ 26.4 | $ 25.1 | $ 5.8 |  |  |
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 (in years) |  |  |  |  |  |  |  |  |  |  |  | 10 |  |
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% |  |
Percentage of vesting of company matching contribution based on length of service |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 100.00%
ExpressJet Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible age to provide medical bridge coverage (in years) |  |  |  | 60 | 65 |  |  |  |  |  |  |  |  |
Minimum period of service required to be completed by retired employees for availing medical bridge coverage (in years) |  |  | 10 |  |  |  |  |  |  |  |  |  |  |
Mandatory retirement age for commercial pilots (in years) | 65 | 60 |  |  |  |  |  |  |  |  |  |  |  |
Company's combined contributions |  |  |  |  |  | $ 16.0 | $ 14.4 | $ 13.3 | $ 26.4 | $ 25.1 | $ 5.8 |  |  |

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 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6962843&loc=d3e1928-114920 + Details
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