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Long-term Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long-term Debt    
Long-term debt $ 1,745,811,000us-gaap_LongTermDebt $ 1,470,568,000us-gaap_LongTermDebt
Less current maturities (211,821,000)us-gaap_LongTermDebtCurrent (177,389,000)us-gaap_LongTermDebtCurrent
Long-term debt, net of current maturities 1,533,990,000us-gaap_LongTermDebtNoncurrent 1,293,179,000us-gaap_LongTermDebtNoncurrent
Aggregate amounts of principal maturities of long-term debt    
2015 211,821,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 216,340,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 190,648,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 168,769,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 161,329,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 796,904,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total 1,745,811,000us-gaap_LongTermDebt 1,470,568,000us-gaap_LongTermDebt
Letters of credit and surety bonds outstanding with various banks and surety institutions 79,900,000skyw_LettersOfCreditAndSuretyBondOutstandingAmount 88,500,000skyw_LettersOfCreditAndSuretyBondOutstandingAmount
CRJ    
Long-term Debt    
Long-term debt 1,700,000,000us-gaap_LongTermDebt
/ us-gaap_AircraftTypeAxis
= skyw_CRJMember
 
Effective interest rate (as a percent) 4.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_AircraftTypeAxis
= skyw_CRJMember
 
Aggregate amounts of principal maturities of long-term debt    
Total 1,700,000,000us-gaap_LongTermDebt
/ us-gaap_AircraftTypeAxis
= skyw_CRJMember
 
E175    
Long-term Debt    
Number of new aircraft acquired 20skyw_NumberOfNewAircraftAcquriedByIssuanceOfDebt
/ us-gaap_AircraftTypeAxis
= skyw_E175Member
 
CRJ 700    
Long-term Debt    
Number of used aircraft acquired 1skyw_NumberOfUsedAircraftAcquiredByIssuanceOfDebt
/ us-gaap_AircraftTypeAxis
= skyw_CRJ700Member
 
Notes payable to banks, due in semi annual installments, variable interest based on LIBOR, or with interest rates ranging from 1.34% to 2.55% through 2015 to 2020, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 1.34%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
 
Interest rate, maximum (as a percent) 2.55%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
 
Long-term debt 28,554,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
31,933,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
Aggregate amounts of principal maturities of long-term debt    
Total 28,554,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
31,933,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom1.34PercentTo2.55PercentDueThrough2014To2020Member
Notes payable to a financing company, due in semi annual installments, variable interest based on LIBOR, or with interest rates ranging from 0.70% to 2.36% through 2015 to 2021, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 0.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
 
Interest rate, maximum (as a percent) 2.36%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
 
Long-term debt 13,551,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
15,740,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
Aggregate amounts of principal maturities of long-term debt    
Total 13,551,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
15,740,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom0.70PercentTo2.36PercentDueThrough2014To2021Member
Notes payable to banks, due in semi annual installments plus interest at 6.06% to 7.18% through 2021, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 6.06%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
 
Interest rate, maximum (as a percent) 7.18%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
 
Long-term debt 572,446,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
623,315,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
Aggregate amounts of principal maturities of long-term debt    
Total 572,446,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
623,315,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom6.06PercentTo7.18PercentDueThrough2021Member
Notes payable to a financing company, due in semi annual installments plus interest at 5.78% to 6.23% through 2019, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 5.78%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
 
Interest rate, maximum (as a percent) 6.23%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
 
Long-term debt 25,090,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
32,528,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
Aggregate amounts of principal maturities of long-term debt    
Total 25,090,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
32,528,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToFinancingCompanyInterestRatesRangingFrom5.78PercentTo6.23PercentDueThrough2019Member
Notes payable to banks, due in monthly installments plus interest of 3.15% to 8.18% through 2025, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 3.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
 
Interest rate, maximum (as a percent) 8.18%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
 
Long-term debt 129,201,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
149,477,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
Aggregate amounts of principal maturities of long-term debt    
Total 129,201,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
149,477,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.15PercentTo8.18PercentDueThrough2025Member
Notes payable to banks, due in semi annual installments, plus interest at 6.05% through 2020, secured by aircraft    
Long-term Debt    
Interest rate (as a percent) 6.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt6.05PercentDueThrough2020Member
 
Long-term debt 350,177,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt6.05PercentDueThrough2020Member
392,660,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt6.05PercentDueThrough2020Member
Aggregate amounts of principal maturities of long-term debt    
Total 350,177,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt6.05PercentDueThrough2020Member
392,660,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt6.05PercentDueThrough2020Member
Notes payable to banks, due in monthly installments, plus interest at 3.10% through 2019, secured by aircraft    
Long-term Debt    
Interest rate (as a percent) 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt3.10PercentDueThrough2019Member
 
Long-term debt 5,909,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt3.10PercentDueThrough2019Member
 
Aggregate amounts of principal maturities of long-term debt    
Total 5,909,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesAt3.10PercentDueThrough2019Member
 
Notes payable to banks, due in quarterly installments, LIBOR plus interest at 2.39% through 2029, secured by aircraft    
Long-term Debt    
Interest rate (as a percent) 2.39%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRateAt2.39PercentDueThrough2029Member
 
Long-term debt 378,406,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRateAt2.39PercentDueThrough2029Member
 
Aggregate amounts of principal maturities of long-term debt    
Total 378,406,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRateAt2.39PercentDueThrough2029Member
 
Notes payable to banks, due in quarterly installments, plus interest at 3.8% to 4.0% through 2029, secured by aircraft    
Long-term Debt    
Interest rate, minimum (as a percent) 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.8PercentTo4.0PercentDueThrough2029Member
 
Interest rate, maximum (as a percent) 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.8PercentTo4.0PercentDueThrough2029Member
 
Long-term debt 68,318,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.8PercentTo4.0PercentDueThrough2029Member
 
Aggregate amounts of principal maturities of long-term debt    
Total 68,318,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom3.8PercentTo4.0PercentDueThrough2029Member
 
Notes payable to a bank, due in monthly installments interest based on LIBOR plus interest at 2.00% to 4.00% through 2016    
Long-term Debt    
Interest rate, minimum (as a percent) 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
 
Interest rate, maximum (as a percent) 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
 
Long-term debt 174,159,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
224,915,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
Aggregate amounts of principal maturities of long-term debt    
Total 174,159,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
224,915,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= skyw_NotesPayableToBanksInterestRatesRangingFrom2.00PercentTo4.00PercentDueThrough2016Member
Line of Credit | SkyWest Airlines    
Long-term Debt    
Interest rate (as a percent) 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Aggregate amounts of principal maturities of long-term debt    
Maximum borrowing capacity 25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Amount outstanding $ 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
$ 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember