Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 225,464us-gaap_NetIncomeLoss	$ 176,918us-gaap_NetIncomeLoss	$ 108,460us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:
Unrealized (gains) losses on open fuel derivative contracts	0	265	46
Equity-based compensation, net	8,797us-gaap_ShareBasedCompensation	5,689us-gaap_ShareBasedCompensation	4,327us-gaap_ShareBasedCompensation
Allowance for doubtful accounts (recoveries)	(45)	143	78
Amortization of deferred gains and losses and debt issuance costs	(185)	(558)	(830)
Depreciation and amortization	46,971us-gaap_DepreciationAndAmortization	31,947us-gaap_DepreciationAndAmortization	15,256us-gaap_DepreciationAndAmortization
Deferred income tax	34,118us-gaap_DeferredIncomeTaxExpenseBenefit	12,047us-gaap_DeferredIncomeTaxExpenseBenefit	29,255us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on disposal of assets	3,008us-gaap_GainLossOnDispositionOfAssets	525us-gaap_GainLossOnDispositionOfAssets	956us-gaap_GainLossOnDispositionOfAssets
Gain on slot sale	0	0	(9,060)
Capitalized interest	(2,747)	(214)	(1,350)
Changes in operating assets and liabilities:
Accounts receivable	606	(461)	(7,393)
Prepaid maintenance reserves	(31,925)	(24,058)	(31,567)
Long-term deposits and other assets	(48,382)	(65,654)	(68,248)
Accounts payable	(10,034)	(1,674)	8,452
Air traffic liability	21,135	36,226	19,134
Other liabilities	13,731	24,235	46,115
Net cash provided by operating activities	260,512	195,376	113,631
Investing activities:
Proceeds from sale of property and equipment	0	0	14
Proceeds from sale of slots	0save_ProceedsfromSaleofAirlineSlots	0save_ProceedsfromSaleofAirlineSlots	9,060save_ProceedsfromSaleofAirlineSlots
Pre-delivery deposits for flight equipment, net of refunds	(115,802)	(70,288)	(12,626)
Purchase of property and equipment	(186,569)	(19,812)	(23,771)
Net cash used in investing activities	(302,371)	(90,100)	(27,323)
Financing activities:
Proceeds from issuance of long-term debt	148,000	0	0
Proceeds from stock options exercised	174	852	469
Payments on debt and capital lease obligations	(1,233)	0	0
Proceeds from sale and leaseback transactions	7,200	6,900	12,540
Payments to pre-IPO shareholders pursuant to tax receivable agreement	(5,643)	0	(26,905)
Excess tax benefits from equity-based compensation	1,871	1,927	2,098
Repurchase of common stock	(1,630)	(1,140)	(1,022)
Debt issuance costs	(4,727)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by financing activities	144,012	8,539	(12,820)
Net increase in cash and cash equivalents	102,153	113,815	73,488
Cash and cash equivalents at beginning of period	530,631	416,816	343,328
Cash and cash equivalents at end of period	632,784	530,631	416,816
Cash payments for:
Interest (net of capitalized interest)	0us-gaap_InterestPaidNet	0us-gaap_InterestPaidNet	0us-gaap_InterestPaidNet
Taxes	89,104us-gaap_IncomeTaxesPaid	85,705us-gaap_IncomeTaxesPaid	40,204us-gaap_IncomeTaxesPaid
Non-cash transactions:
Liability and equity related to tax receivable agreement	0	(2,336)	(1,497)
Capital expenditures funded by capital lease borrowings	$ (173)us-gaap_CapitalLeaseObligationsIncurred	$ (3,234)us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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