Allegiant Travel (ALGT) 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 01, 2014	Jun. 30, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'Allegiant Travel CO	'	'
Document Type	'10-K	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Public Float	'	'	$1.60
Entity Common Stock, Shares Outstanding	'	18,595,051	'
Amendment Flag	'false	'	'
Entity Central Index Key	'0001362468	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Well Known Seasoned Issuer	'Yes	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$97,711	$89,557
Restricted cash	10,531	10,046
Short-term investments	253,378	239,139
Accounts receivable	16,857	18,635
Expendable parts, supplies and fuel, net of an allowance for obsolescence of $1,702 and $875 at December 31, 2013 and December 31, 2012, respectively	19,428	18,432
Prepaid expenses	26,643	24,371
Deferred income taxes	4,206	796
Other current assets	1,167	14,291
Total current assets	429,921	415,267
Property and equipment, net	451,584	351,204
Restricted cash, net of current portion	305	150
Long-term investments	36,037	24,030
Investment in and advances to unconsolidated affiliates, net	1,655	2,007
Deposits and other assets	10,689	5,536
Total assets	930,191	798,194
Current liabilities:	'	'
Current maturities of long-term debt	20,237	11,623
Accounts payable	15,823	14,533
Accrued liabilities	87,203	36,476
Air traffic liability	167,388	147,914
Total current liabilities	290,651	210,546
Long-term debt and other long-term liabilities: [Abstract]	'	'
Long-term debt, net of current maturities	214,063	139,229
Deferred income taxes	48,160	46,695
Total liabilities	552,874	396,470
Stockholders' equity:	'	'
Common stock, par value $.001, 100,000,000 shares authorized; 22,036,893 and 21,899,155 shares issued; 18,544,248 and 19,333,516 shares outstanding, as of December 31, 2013 and December 31, 2012, respectively	22	22
Treasury stock, at cost, 3,492,645 and 2,565,639 shares at December 31, 2013 and December 31, 2012, respectively	-186,291	-102,829
Additional paid in capital	209,213	201,012
Accumulated other comprehensive loss, net	-12	-69
Retained earnings	352,811	302,325
Total Allegiant Travel Company stockholders' equity	375,743	400,461
Noncontrolling interest	1,574	1,263
Total equity	377,317	401,724
Total liabilities and stockholders' equity	$930,191	$798,194

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Allowance for obsolescence (in dollars)	$1,702	$875
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	22,036,893	21,899,155
Common stock, shares outstanding	18,544,248	19,333,516
Treasury stock, shares	3,492,645	2,565,639

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING REVENUE:	'	'	'
Scheduled service revenue	$651,318	$586,036	$514,984
Ancillary revenue:	'	'	'
Air-related charges	287,857	235,436	180,078
Third party products	37,030	36,124	29,916
Total ancillary revenue	324,887	271,560	209,994
Fixed fee contract revenue	17,462	42,905	43,690
Other revenue	2,483	8,218	10,449
Total operating revenue	996,150	908,719	779,117
OPERATING EXPENSES:	'	'	'
Aircraft fuel	385,558	378,195	330,657
Salary and benefits	158,627	133,295	119,856
Station operations	78,231	78,357	66,709
Maintenance and repairs	72,818	73,897	81,228
Sales and marketing	21,678	19,222	19,905
Aircraft lease rentals	9,227	0	1,101
Depreciation and amortization	69,264	57,503	41,975
Other	46,010	35,946	32,242
Total operating expenses	841,413	776,415	693,673
OPERATING INCOME	154,737	132,304	85,444
OTHER (INCOME) EXPENSE:	'	'	'
Earnings from unconsolidated affiliates, net	-393	-99	-9
Interest income	-1,043	-983	-1,236
Interest expense	9,493	8,739	7,175
Total other expense	8,057	7,657	5,930
INCOME BEFORE INCOME TAXES	146,680	124,647	79,514
PROVISION FOR INCOME TAXES	54,901	46,233	30,116
NET INCOME	91,779	78,414	49,398
Net loss attributable to noncontrolling interest	-494	-183	0
NET INCOME ATTRIBUTABLE TO ALLEGIANT TRAVEL COMPANY	$92,273	$78,597	$49,398
Earnings per share to common stockholders:	'	'	'
Basic (in Dollars per share)	$4.85	$4.10	$2.59
Diluted (in Dollars per share)	$4.82	$4.06	$2.57
Weighted average shares outstanding used in computing earnings per share to common stockholders:	'	'	'
Basic (in Shares)	18,936	19,079	18,935
Diluted (in Shares)	19,050	19,276	19,125

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income	$91,779	$78,414	$49,398
Other comprehensive income:	'	'	'
Unrealized gain (loss) on available-for-sale securities	90	-69	-27
Income tax (expense) benefit related to unrealized gain or loss on available-for-sale securities	-33	26	10
Total other comprehensive income (loss)	57	-43	-17
Total comprehensive income	91,836	78,371	49,381
Comprehensive loss attributable to noncontrolling interest	-494	-183	0
Comprehensive income attributable to Allegiant Travel Company	$92,330	$78,554	$49,381

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividends, Cash	($41,787)	($38,602)	'
OPERATING ACTIVITIES:	'	'	'
Net income	91,779	78,414	49,398
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	69,264	57,503	41,975
Loss on aircraft and other equipment disposals	8,000	4,084	4,794
Provision for obsolescence of expendable parts, supplies and fuel	827	480	225
Amortization of deferred financing costs and original issue discount	612	579	411
Stock-based compensation expense	9,818	4,069	4,735
Deferred income taxes	-1,945	6,362	13,977
Excess tax benefits from stock-based compensation	-1,689	-2,724	-409
Changes in certain assets and liabilities:	'	'	'
Restricted cash	-640	5,290	5,801
Accounts receivable	1,778	-5,769	-5,014
Expendable parts, supplies and fuel	-1,823	-4,373	-1,381
Prepaid expenses	-8,526	490	-790
Other current assets	3,124	286	-3,337
Accounts payable	3,140	891	3,065
Accrued liabilities	3,695	2,044	-910
Air traffic liability	19,474	29,146	17,371
Net cash provided by operating activities	196,888	176,772	129,911
INVESTING ACTIVITIES:	'	'	'
Purchase of investment securities	-351,616	-385,095	-359,035
Proceeds from maturities of investment securities	325,367	290,669	227,232
Purchase of property and equipment, including pre-delivery deposits	-177,516	-105,084	-86,582
Interest during refurbishment of aircraft	-123	-498	-405
Proceeds from sale of property and equipment	471	1,613	951
Investment in unconsolidated affiliates, net	352	-27	3
Change in deposits and other assets	10,233	-10,405	9,613
Net cash used in investing activities	-192,832	-208,827	-208,223
FINANCING ACTIVITIES:	'	'	'
Cash dividends paid to shareholders	0	-38,602	0
Excess tax benefits from stock-based compensation	1,689	2,724	409
Proceeds from exercise of stock options and stock-settled SARs	2,083	7,542	1,834
Proceeds from the issuance of long-term debt	106,000	13,981	139,000
Repurchase of common stock	-83,607	-4,994	-1,922
Principal payments on long-term debt	-22,656	-9,321	-21,151
Payments for deferred financing costs	-811	-308	-2,411
Payments for sale of ownership interest in subsidiary	1,400	-150	0
Net cash provided by (used in) financing activities	4,098	-29,128	115,759
Net change in cash and cash equivalents	8,154	-61,183	37,447
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	89,557	150,740	113,293
CASH AND CASH EQUIVALENTS AT END OF PERIOD	97,711	89,557	150,740
Cash Transactions:	'	'	'
Interest paid, net of amount capitalized	8,710	8,638	6,592
Income taxes paid, net of refunds	53,220	37,937	23,507
Non- cash transactions:	'	'	'
Assets acquired in sale of ownership interest in subsidiary	530	1,225	0
Assets sold in acquisition of ownership interest in subsidiary	1,225	'	0
Deposits applied against flight equipment purchase	0	'	1,277
Parent [Member]	'	'	'
Dividends, Cash	-41,787	-38,602	'
OPERATING ACTIVITIES:	'	'	'
Net income	92,273	78,597	49,398
Non- cash transactions:	'	'	'
Assets sold in acquisition of ownership interest in subsidiary	$0	'	'

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity Statement (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Parent [Member]	Noncontrolling Interest [Member]
In Thousands
Balance at at Dec. 31, 2010	$297,735	$21	$180,704	($9)	$212,932	($95,913)	$297,735	$0
Balance at (Shares) at Dec. 31, 2010	'	21,456	'	'	'	'	'	'
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	4,201	0	4,201	0	0	0	4,201	0
Stock Issued During Period, Shares, Restricted Stock Award, Gross	'	49	'	'	'	'	'	'
StockIssuedDuringPeriodSharesStockOptionsSARsExercised	'	73	'	'	'	'	'	'
Exercises of stock options and stock-settled SARs	1,835	1	1,834	0	0	0	1,835	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	274	0	274	0	0	0	274	0
Assets sold in acquisition of ownership interest in subsidiary	0	'	'	'	'	'	'	'
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	'	-4	'	'	'	'	'	'
Treasury Stock, Value, Acquired, Cost Method	-1,922	0	0	0	0	-1,922	-1,922	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	-17	0	0	-17	0	0	-17	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	49,398	0	0	0	49,398	0	49,398	0
Balance at at Dec. 31, 2011	351,504	22	187,013	-26	262,330	-97,835	351,504	0
Balance at (Shares) at Dec. 31, 2011	'	21,574	'	'	'	'	'	'
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	3,660	0	3,660	0	0	0	3,660	0
Stock Issued During Period, Shares, Restricted Stock Award, Gross	'	94	'	'	'	'	'	'
StockIssuedDuringPeriodSharesStockOptionsSARsExercised	'	250	'	'	'	'	'	'
Exercises of stock options and stock-settled SARs	7,542	0	7,542	0	0	0	7,542	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	2,797	0	2,797	0	0	0	2,797	0
Assets acquired and services rendered in sale of ownership interest in subsidiary	1,446	0	0	0	0	0	0	1,446
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	'	-19	'	'	'	'	'	'
Treasury Stock, Value, Acquired, Cost Method	-4,994	0	0	0	0	-4,994	-4,994	0
Dividends, Cash	-38,602	0	0	0	-38,602	0	-38,602	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	-43	0	0	-43	0	0	-43	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	78,414	0	0	0	78,597	0	78,597	-183
Balance at at Dec. 31, 2012	401,724	22	201,012	-69	302,325	-102,829	400,461	1,263
Balance at (Shares) at Dec. 31, 2012	'	21,899	'	'	'	'	'	'
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	4,430	0	4,430	0	0	0	4,430	0
Stock Issued During Period, Shares, Restricted Stock Award, Gross	'	85	'	'	'	'	'	'
StockIssuedDuringPeriodSharesStockOptionsSARsExercised	'	56	'	'	'	'	'	'
Exercises of stock options and stock-settled SARs	2,082	0	2,082	0	0	0	2,082	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	1,689	0	1,689	0	0	0	1,689	0
Assets sold in acquisition of ownership interest in subsidiary	-1,225	0	0	0	0	0	0	-1,225
Assets acquired and services rendered in sale of ownership interest in subsidiary	2,030	0	0	0	0	0	0	2,030
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	'	-3	'	'	'	'	'	'
Treasury Stock, Value, Acquired, Cost Method	-83,462	0	0	0	0	-83,462	-83,462	0
Dividends, Cash	-41,787	0	0	0	-41,787	0	-41,787	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	57	0	0	57	0	0	57	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	91,779	0	0	0	92,273	0	92,273	-494
Balance at at Dec. 31, 2013	$377,317	$22	$209,213	($12)	$352,811	($186,291)	$375,743	$1,574
Balance at (Shares) at Dec. 31, 2013	'	22,037	'	'	'	'	'	'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]	'	'
Common Stock, Dividends, Per Share, Declared	$2.25	$2

Organization_and_Business_of_C

Organization and Business of Company (Notes)	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Business of Company	'
	Organization and Business of Company
	Allegiant Travel Company (the “Company”) is a leisure travel company focused on providing travel services and products to residents of small, underserved cities in the United States.  The Company operates a low-cost passenger airline marketed primarily to leisure travelers in small cities, allowing it to sell air transportation both on a stand-alone basis and bundled with the sale of air-related and third party services and products.  The Company also provides air transportation under fixed-fee flying arrangements.  Because scheduled service and fixed fee air transportation services have similar operating margins, economic characteristics, "production processes" involving check-in, baggage handling and flight services which target the same class of customers and are subject to the same regulatory environment, the Company believes it operates in one reportable segment. Additionally, the Company does not separately track expenses for the scheduled service and fixed fee air transportation services.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Basis of Presentation: The accompanying consolidated financial statements include the accounts of Allegiant Travel Company and its majority-owned operating subsidiaries. The Company's investments in unconsolidated affiliates which are 50% or less owned are accounted for under the equity method. All intercompany balances and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Due to the prospective nature of these estimates, actual results could differ from those estimates.
	Cash and Cash Equivalents
	Cash and cash equivalents include investments and interest bearing instruments with maturities of three months or less at the date of acquisition. Such investments are carried at cost which approximates fair value.
	Restricted Cash
	Restricted cash represents escrowed funds under fixed fee contracts, cash collateral against notes payable and cash collateral against letters of credit required by hotel properties for guaranteed room availability, airports and certain other parties.
	Accounts Receivable
	Accounts receivable are carried at cost which approximates fair value. They consist primarily of amounts due from credit card companies associated with the sale of tickets for future travel, and amounts due related to fixed fee charter agreements.  If deemed necessary, the Company records an allowance for doubtful accounts for amounts not expected to be collected. The Company did not record allowance for doubtful accounts as of December 31, 2013, and 2012. In addition, accounts receivable write offs for the years ended December 31, 2013, 2012, and 2011 were immaterial.
	Investment Securities
	The Company’s investments in marketable securities are classified as available-for-sale and are reported at fair market value with the net unrealized gain or (loss) reported as a component of accumulated other comprehensive income in stockholders’ equity. Investment securities are classified as cash equivalents, short-term investments and long-term investments based on maturity date.  Cash equivalents have maturities of three months or less, short-term investments have maturities of greater than three months but equal to or less than one year and long-term investments are those with a maturity date greater than one year.  As of December 31, 2013, the Company’s long-term investments consisted of government debt securities and municipal debt securities with contractual maturities of less than 18 months.  Investment securities consisted of the following:
		As of December 31, 2013											As of December 31, 2012
					Gross Unrealized										Gross Unrealized
		Cost			Gains			(Losses)			Market Value		Cost		Gains		(Losses)			Market Value
	Money market funds	$	20,172		$	—		$	—		$	20,172	$	3,689	$	—	$	—		$	3,689
	Certificates of deposit	—			—			—			—		5,862		1		—			5,863
	Commercial paper	75,905			8			(2		)	75,911		82,163		16		(42		)	82,137
	Municipal debt securities	181,870			17			(19		)	181,868		190,507		—		(33		)	190,474
	Government debt securities	10,008			—			—			10,008		22,011		2		—			22,013
	Corporate debt securities	45,150			—			(16		)	45,134		33,310		—		(13		)	33,297
	Total	$	333,105		$	25		$	(37	)	$	333,093	$	337,542	$	19	$	(88	)	$	337,473
	The amortized cost of investment securities sold is determined by the specific identification method with any realized gains or losses reflected in other (income) expense.  The Company had minimal realized losses during the years ended December 31, 2013 and 2012 and no realized gains or losses during the year ended December 31, 2011.
	The Company believes unrealized losses related to debt securities are not other-than-temporary.
	Expendable Parts, Supplies and Fuel
	Expendable parts, supplies and fuel inventories are valued at cost using the first-in, first-out method. Such inventories are charged to expense as they are used in operations.  An allowance for obsolescence on aircraft spare parts is recognized over the remaining useful life of the Company’s aircraft fleet.
	Software Capitalization
	The Company capitalizes certain internal and external costs related to the acquisition and development of computer software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which typically ranges from three to five years.  The Company had unamortized computer software development costs of $20,136 and $16,233 as of December 31, 2013 and 2012, respectively.  Amortization expense related to computer software was $3,347, $1,539 and $986 for the years ended December 31, 2013, 2012 and 2011, respectively.  Costs incurred during the preliminary and post-implementation stages of software development are expensed as incurred.
	Property and Equipment
	Property and equipment are recorded at cost and depreciated using the straight-line method to their estimated residual values over their estimated useful lives as follows:
	Aircraft and engines (years)	15-Jan
	Rotable parts (years)	7
	Ground equipment and leasehold improvements (years)	7-Mar
	Aircraft and engines have an estimated average residual value of 14.7 percent of original cost; other property and equipment are assumed to have no residual value.
	In estimating the useful lives and residual values of its aircraft, the Company primarily has relied upon actual experience with the same or similar aircraft types, current and projected future market information, and recommendations from aircraft manufacturers.  Subsequent revisions to these estimates could be caused by changing market prices of the Company’s aircraft, changes in utilization of the aircraft, and other fleet events.  These estimates are evaluated each reporting period and adjusted if necessary. Changes in the estimate for useful lives or residual values of the Company’s property and equipment could result an acceleration of depreciation expense.
	Leased Aircraft Return Costs
	The Company is party to operating lease agreements which contain aircraft return provisions.  These provisions require the Company to compensate the lessor based on specific time remaining on certain aircraft and engine components between scheduled maintenance events.  A liability associated with returning leased aircraft is accrued when it is probable that a cash payment will be made and that amount is reasonably estimable.  Any accrual is based on the time remaining on the lease, planned aircraft usage and other provisions included in the lease agreement, although the actual amount due to any lessor upon return will not be known with certainty until lease termination. As of December 31, 2013 the Company has accrued $1.4 million in leased return conditions.
	Investment in Unconsolidated Affiliates
	The Company uses the equity method to account for AFH Inc.’s, a wholly-owned subsidiary, investment in a fuel venture. AFH, Inc. has a 50 percent interest in a jointly owned entity with OSI (an affiliate of the Orlando Sanford International Airport) to handle certain fuel operations for the Orlando Sanford International Airport. The entity, SFB Fueling LLC, is responsible for the purchase and transport of jet fuel to a fuel farm facility owned and operated by OSI, and for the sale of jet fuel to air carriers at the Orlando Sanford International Airport. In addition, AFH, Inc. is responsible for the administrative functions for the joint venture. The Company’s proportionate allocation of net income or loss from this investment and from an investment in an aviation services company are reported in the Company’s consolidated statements of income in other (income) expense, with an adjustment to the recorded investment in the Company’s consolidated balance sheet. These investments treated under the equity method are not material to the financial position or results of operations of the Company.
	Capitalized Interest
	Interest attributable to funds used to finance the refurbishment of aircraft prior to revenue service is capitalized as an additional cost of the related asset provided the refurbishment is extensive or requires an extended period of time to complete, generally longer than 90 days. Interest is capitalized at the Company’s average interest rate on long-term debt and ceases when the asset is ready for service. For the years ended December 31, 2013, 2012 and 2011, respectively, the Company recorded gross interest expense of $9,616, $9,237 and $7,580, of which $123, $498 and $405 respectively, was capitalized.
	Measurement of Impairment of Long-Lived Assets
	The Company records impairment losses on long-lived assets used in operations, consisting principally of property and equipment, when events or changes in circumstances indicate, in management’s judgment, that the assets might be impaired and the undiscounted future cash flows estimated to be generated by those assets are less than the carrying amount of those assets.  In making these determinations, the Company utilizes certain assumptions, including, but not limited to: (i) estimated fair market value of the assets; and (ii) estimated future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service the asset will be used in operations, and estimated salvage values.
	For the years ended December 31, 2013, 2012 and 2011, the Company incurred impairment losses on spare engine parts of $5,315, $2,768 and $2,486, respectively.
	Revenue Recognition
	Scheduled service revenue consists of passenger revenue generated from nonstop flights in the Company’s route network recognized when the travel-related service or transportation is provided or when the itinerary expires unused. Nonrefundable scheduled itineraries expire on the date of the intended flight, unless the date is extended by notification from the customer in advance. Itineraries sold for transportation, but not yet used, as well as unexpired credits, are included in air traffic liability.
	Various taxes and fees assessed on the sale of tickets to customers are collected by the Company as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the Company’s consolidated statements of income and recorded as a liability until remitted to the appropriate taxing authority.
	Fixed fee contract revenue consists largely of agreements to provide charter service on a year-round and ad hoc basis.  Fixed fee contract revenue is recognized when the transportation is provided.
	Ancillary revenue is generated from air-related fees paid by ticketed passengers and the sale of third party products. Air-related charges consists of baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services.  Revenues from air-related charges are recognized when the transportation is provided if the product is not deemed independent of the original ticket sale.  Change and cancellation fees to nonrefundable itineraries are air-related charges deemed independent of the original ticket sale and are recognized as revenue as they occur.
	Ancillary revenue is also generated from the sale of third party products such as hotel rooms, rental cars, ticket attractions, and other items. Revenues from the sale of third party products are recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows accounting standards for revenue arrangements with multiple deliverables to determine the amount of revenue to be recognized for each element of a bundled sale involving air-related charges and third party products in addition to airfare. Revenue from the sale of third party products is recorded net of amounts paid to wholesale providers, travel agent commissions, and transaction costs.
	Other revenue is generated from leased out aircraft and flight equipment and other miscellaneous sources. Lease revenue is recognized on a straight-line basis over the lease term.
	Maintenance and Repair Costs
	The Company accounts for aircraft maintenance activities under the direct expense method. Under this method, maintenance and repair costs for owned and leased aircraft, including major aircraft maintenance activities, are charged to operating expenses as incurred.
	Advertising Costs
	Advertising costs are charged to expense in the period incurred. Advertising expense was $4,160, $4,201 and $5,159 for the years ended December 31, 2013, 2012 and 2011, respectively.
	Earnings per Share
	Basic and diluted earnings per share are computed pursuant to the two-class method. Under this method, the Company attributes net income to two classes, common stock and unvested restricted stock awards. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities as they receive non-forfeitable rights to cash dividends at the same rate as common stock.
	Diluted net income per share is calculated using the more dilutive of two methods. Under both methods, the exercise of employee stock options and stock-settled stock appreciation rights are assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs:
	1	Assume vesting of restricted stock using the treasury stock method.
	2	Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method.
	For the years ended December 31, 2013, 2012 and 2011, the second method above which assumes unvested awards are not vested was used in the computation because it was more dilutive than the first method above which assumes vesting of awards using the treasury stock method.  The following table sets forth the computation of net income per share on a basic and diluted basis for the periods indicated (shares in table below in thousands):
		Year ended December 31,
		2013			2012			2011
Basic:
Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
Less: Net income allocated to participating securities	(381		)	(295		)	(283		)
Net income attributable to common stock	$	91,892		$	78,302		$	49,115
Net income per share, basic	$	4.85		$	4.1		$	2.59
Weighted-average shares outstanding	18,936			19,079			18,935
Diluted:
Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
Less: Net income allocated to participating securities	(378		)	(292		)	(280		)
Net income attributable to common stock	$	91,895		$	78,305		$	49,118
Net income per share, diluted	$	4.82		$	4.06		$	2.57
Weighted-average shares outstanding	18,936			19,079			18,935
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	154			228			209
Adjusted weighted-average shares outstanding under treasury stock method	19,090			19,307			19,144
Participating securities excluded under two-class method	(40		)	(31		)	(19		)
Adjusted weighted-average shares outstanding under two-class method	19,050			19,276			19,125
Stock-Based Compensation
The Company accounts for stock-based compensation in accordance with accounting standards which require the compensation cost relating to share-based payment transactions be recognized in the Company’s consolidated statements of income. The cost is measured at the grant date, based on the calculated fair value of the award using the Black-Scholes option pricing model for stock options and stock appreciation rights (“SARs”), and based on the closing share price of the Company’s stock on the grant date for restricted stock awards. The cost is recognized as an expense over the employee’s requisite service period (the vesting period of the award). The vesting period of the Company’s awards is generally three years. The Company’s stock-based employee compensation plan is more fully discussed in Note 12—Employee Benefit Plans.
Concentration Risk
The Company attempts to minimize its concentration risk with regard to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security, commercial paper, or money market fund.
Income Taxes
The Company recognizes deferred income taxes based on the asset and liability method required by ASC 740. Deferred tax assets and liabilities are determined based on the timing differences between book basis for financial reporting purposes and tax basis of the asset and liability and measured using the enacted tax rates. A valuation allowance for deferred tax assets is provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company determines the net current and non-current deferred tax assets or liabilities separately for federal, state, and other local jurisdictions.
The Company’s income tax returns are subject to examination by the Internal Revenue Service (“IRS”) and other tax authorities in the jurisdictions where the Company operates. The Company assesses potentially unfavorable outcomes of such examinations based on the criteria set forth in uncertain tax position accounting standards. The accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements.
Accounting standards for income taxes utilize a two-step approach for evaluating tax positions. Recognition (Step I) occurs when the Company concludes that a tax position, based on its technical merits, is more likely than not to be sustained upon examination. Measurement (Step II) is only addressed if the position is deemed to be more likely than not to be sustained. Under Step II, the tax benefit is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement.
The tax positions failing to qualify for initial recognition are recognized in the first subsequent interim period they meet the “more likely than not” standard. If it is subsequently determined that a previously recognized tax position no longer meets the “more likely than not” standard, it is required that the tax position be derecognized. As applicable, the Company will recognize accrued penalties and interest related to unrecognized tax benefits in the provision for income taxes.
Recent Accounting Pronouncements
In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update No. 2013-02 (“ASU 2013-02”), Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Some of the key amendments require the Company to present, either on the face of the statement of operations or in the notes to the consolidated financial statements, the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income, but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, the Company is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU 2013-02 became effective for the Company’s annual and interim periods beginning January 1, 2013. The Company adopted the updated guidance in the first quarter of 2013. The adoption impacts the presentation of the Company’s consolidated financial statements, but does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income.

Property_and_Equipment_Notes

Property and Equipment (Notes)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment Disclosure	'
	Property and Equipment
	As of December 31, 2013, the Company owned 54 MD-80 aircraft, six Boeing 757-200 aircraft, seven Airbus A320 aircraft, and one Airbus 319 aircraft. Of the seven Airbus A320 aircraft, five were placed into service during the fourth quarter of 2013 and the remaining two were placed into service in January 2014. As of December 31, 2012, the Company owned 58 MD-80 aircraft and six Boeing 757-200 aircraft.
	Property and equipment consist of the following:
		As of December 31,			As of December 31,
		2013			2012
	Flight equipment	$	629,715		$	515,501
	Ground property and equipment	73,638			43,318
	Total property and equipment	703,353			558,819
	Less accumulated depreciation and amortization	(251,769		)	(207,615		)
	Property and equipment, net	$	451,584		$	351,204
	The following table summarizes the Company's total aircraft fleet as of December 31, 2013:
	Aircraft Type		Owned (1)		Leased			Total	Seating Capacity	Average Age
									(per aircraft)	in Years
	MD-88/82/83 (2)		54		—			54	150/166	24
	B757-200		6		—			6	223	20.8
	A319		1		2			3	156	9.2
	A320 (3)		7		—			7	177	13.2
	Total aircraft		68		2			70
	-1	All of the Company's owned aircraft are encumbered.  Refer to Note 5 – Long-Term Debt for discussion of the Company's notes payable and senior secured term loan facility.
	-2	Of the 54 MD-80 aircraft, 52 were in revenue service and two were in temporary storage. The two MD-80 aircraft will be removed from temporary storage and placed in revenue service during the first quarter of 2014 once modification to a 166 seat configuration is complete. One MD-80 aircraft was retired on February 1, 2014. During 2013, the Company continued its MD-80 seat reconfiguration program.  As of December 31, 2013, 51 of the Company's 52 MD-80 aircraft in revenue service have 166 seats and one aircraft has 150 seats.
	-3	Of the seven Airbus A320 aircraft at December 31, 2013, 2 were being prepared for revenue service. As of February 1, 2014, these 2 Airbus A320 aircraft had been placed in revenue service.

Accrued_Liabilities_Notes

Accrued Liabilities (Notes)	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
Accounts Payable and Accrued Liabilities Disclosure	'
	Accrued Liabilities
	Accrued liabilities consist of the following:
		As of December 31,		As of December 31,
		2013		2012
	Salaries, wages and benefits	$	23,355	$	11,827
	Maintenance and repairs	3,166		8,632
	Passenger fees payable	5,638		4,934
	Passenger taxes payable	948		917
	Station expenses	8,257		8,935
	Interest payable	723		522
	Dividend payable	41,787		—
	Other accruals	3,329		709
	Total accrued liabilities	$	87,203	$	36,476
	As of December 31, 2013, the increase in salaries, wages and benefits is mostly due to a $12.1 million bonus accrual as the Company achieved higher profits in 2013 compared to 2012. The increase in other accruals from 2012 to 2013 is due primarily to a dividend payable of $2.25 per share on outstanding common stock to stockholders of record on December 13, 2013. Total capital distribution for the approved dividend was $41.8 million and was paid in January 2014.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	Long-term debt consisted of the following:
		As of December 31, 2013		As of December 31, 2012
	Senior secured term loan facility, interest at LIBOR plus 4.25% with LIBOR floor of 1.5%, due March 2017	$	121,230	$	122,376
	Notes payable, secured by aircraft, interest at LIBOR plus 2.46%, due November 2019	48,000		—
	Notes payable, secured by real estate, interest at 2.86%, due October 2018	9,953		—
	Notes payable, secured by aircraft, interest at 3.99%, due October 2018	45,775		—
	Notes payable, secured by aircraft, interest at 4.65%, due July 2016	9,342		12,668
	Notes payable, secured by aircraft, interest at 4.95%, due October 2015	—		5,102
	Notes payable, secured by aircraft, interest at 6.28%, due March 2015	—		4,150
	Notes payable, secured by aircraft, interest at 6.26%, due August 2014	—		6,556
	Total long-term debt	234,300		150,852
	Less current maturities	20,237		11,623
	Long-term debt, net of current maturities	$	214,063	$	139,229
	Maturities of long-term debt, as of December 31, 2013, for the next five years and thereafter, in aggregate, are: 2014 - $20,133; 2015 - $20,935; 2016 - $20,156; 2017 - $135,285; 2018 - $24,048; and thereafter – $13,743.
	Senior Secured Term Loan Facility
	In March 2011, the Company borrowed $125,000 under a senior secured term loan facility (the “Term Loan”). The Term Loan matures in March 2017, bears interest based on the London Interbank Offered Rate (“LIBOR”) or prime rate with interest payable quarterly or more frequently until maturity and includes a LIBOR floor of 1.5 percent. The Term Loan contains restrictions on future borrowing, provides for maximum annual capital expenditures and contains other affirmative and negative covenants. In addition to quarterly principal payments equal to 0.25 percent of the initial loan, the Term Loan also provides for mandatory and optional prepayment provisions. The following assets are pledged as collateral under the Term Loan--all MD-80 aircraft, four Boeing 757-200 aircraft and related aircraft spare parts.
	The mandatory prepayment provisions are associated with cash proceeds from the sale of certain assets (which are not reinvested), cash proceeds from the issuance or incurrence of indebtedness for money borrowed in violation of the covenants in the Term Loan, cash proceeds from insurance or condemnation awards (which are not reinvested) and for 25 percent of the Company’s excess cash flow (as defined in the Term Loan) if the Company’s leverage ratio exceeds 1.5:1 as of the end of any year.  In the event the Company does not reinvest the cash proceeds from the sale of certain assets or from insurance or condemnation awards or if the Company incurs indebtedness in violation of the covenants in the Term Loan, the prepayment will be due within three business days following the date of the event requiring the prepayment.  The prepayment associated with a failure to meet the leverage ratio test would be payable within a specified number of days after the end of the year for the covenant calculation.
	As of December 31, 2013, management believes the Company is in compliance with all covenants under the Term Loan and no events occurred which would have required any prepayment of the debt.
	Other
	In September 2013, the Company borrowed $48,000 under a modified loan agreement secured by three Airbus A320 aircraft and one Airbus A319 aircraft.  The note payable issued under the modified loan agreement bears interest at 3.99 percent per annum and is payable in monthly installments through October 2018.  The Company applied a portion of the proceeds to prepay existing debt obligations of $10,485 secured by four Boeing 757 aircraft due through October 2015.
	In October 2013, the Company borrowed $10,000 under a loan agreement secured by the real estate purchased for the Company's headquarter offices in second quarter of 2013. The note payable issued under the loan agreement bears interest at 2.86 percent per annum and is payable in monthly installments through October 2018 when a balloon payment is due.
	In November 2013, the Company borrowed $48,000 under a loan agreement secured by four Airbus A320 aircraft.  The notes payable issued under the loan agreement bear interest at LIBOR plus 2.46 percent per annum and are payable in monthly installments through November 2019.

Leases_Notes

Leases (Notes)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Leases	'
	Leases
	The Company leases aircraft and other assets, including office facilities, airport and terminal facilities, and office equipment.  These leases have terms extending through 2023.  Total rental expense for aircraft and non-aircraft operating leases for the years ended December 31, 2013, 2012 and 2011 was $13,098, $8,322 and $8,336, respectively. During 2013, the Company incurred $5.5 million of aircraft lease rental expense as the Company leased two aircraft in the fourth quarter of 2013 and incurred $4.2 million of lease sub-service expenses related to delays in placing owned Airbus A320 aircraft into revenue service.
	Aircraft leases
	In August 2012, the Company entered into operating lease agreements for nine Airbus A319 aircraft with lease term expiration dates ranging from 2021 to 2023.  As of December 31, 2013, the Company has accepted delivery and placed into service two of these Airbus A319 aircraft.  The operating lease agreements contain aircraft return provisions which require the Company to compensate the lessor based on specific time remaining on certain aircraft and engine components between scheduled maintenance events.  These costs of returning aircraft to lessors are accounted for in a manner similar to the accounting for contingent rent.
	Airport and other facilities leases
	The office facilities under lease include approximately 70,000 square feet of space for the Company’s primary corporate offices.  The lease expires in 2018, has two five-year renewal options, but the Company has the right to terminate after the seventh year of the lease in April 2015. The Company has the right to purchase the building at fair value under the terms of the lease.  The Company also leases approximately 10,000 square feet of office space in a building adjacent to its corporate offices which is utilized for training and other corporate purposes. The Company is responsible for its share of common area maintenance charges.
	Airport and terminal facility leases are entered into with a number of local governments and other third parties. These lease arrangements have a variety of terms and conditions. As of December 31, 2013 we had $1.4 million in lease improvements related to office and commissary buildings at the Bellingham International Airport, WA. Lease improvements made at other airport facilities are not material.
	Scheduled future minimum lease payments
	At December 31, 2013, scheduled future minimum lease payments under operating leases with initial or remaining non-cancelable lease terms in excess of one year are as follows:
		Aircraft Leases		Property Facility Leases		Operating Leases
	2014	$	3,798	$	5,480	$	9,278
	2015	12,259		4,072		17,691
	2016	15,792		2,710		20,918
	2017	15,792		—		18,302
	2018	15,792		—		16,258
	Thereafter	60,296		—		60,359
	Total	$	123,729	$	12,262	$	142,806
	In addition, scheduled future minimum airport fee payments under airport use and lease agreements with fixed and remaining non-cancelable terms in excess of one year are: 2014 - $10,544;  2015 - $10,193; and thereafter - $10,193.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	The Company is authorized by the Board of Directors to acquire the Company’s stock through open market purchases under its share repurchase program. During 2013, the Company repurchased 913,806 shares through open market purchases at an average cost of $91.33 per share for a total expenditure of $83,462. During 2012, the Company repurchased 54,730 shares through open market purchases at an average cost of $72.73 per share for a total expenditure of $3,981. During 2011, the Company repurchased 34,323 shares through open market purchases at an average cost of $43.49 per share for a total expenditure of $1,493. As of December 31, 2013, the Company had $39,814 in unused stock repurchase authority remaining under the Board approved program.
	On November 14, 2013, the Company’s Board of Directors declared a special cash dividend of $2.25 per share on its outstanding common stock payable to stockholders of record on December 13, 2013.  On January 3, 2014, the Company paid cash dividends of $41,787 to these stockholders.
	On November 13, 2012, the Company’s Board of Directors declared a special cash dividend of $2.00 per share on its outstanding common stock payable to stockholders of record on November 30, 2012.  On December 14, 2012, the Company paid cash dividends of $38,602 to these stockholders.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	The Company measures certain financial assets and liabilities at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 - Defined as observable inputs such as quoted prices in active markets for identical assets or liabilities
	Level 2 - Defined as inputs other than Level 1 inputs that are either directly or indirectly observable
	Level 3 - Defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions
	The Company uses the market approach valuation technique to determine fair value for investment securities. The assets classified as Level 1 consist of money market funds for which original cost approximates fair value. The assets classified as Level 2 consist of certificates of deposit, commercial paper, municipal debt securities, government debt securities, and corporate debt securities, which are valued using quoted market prices or alternative pricing sources including transactions involving identical or comparable assets and models utilizing market observable inputs.
	For those assets classified as Level 2 that are not in active markets, the Company obtained fair value from pricing sources using quoted market prices for identical or comparable instruments and based on pricing models which include all significant observable inputs, including maturity dates, issue dates, settlement date, benchmark yields, reported trades, broker-dealer quotes, issue spreads, benchmark securities, bids, offers and other market related data. These inputs are observable or can be derived from or corroborated by observable market data for substantially the full term of the asset.
	Assets measured at fair value on a recurring basis at December 31, 2013 and December 31, 2012 were as follows:
				Fair Value Measurements at Reporting Date Using
	Description	December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Cash equivalents
	Money market funds	$	20,172	$	20,172	$	—	$	—
	Municipal debt securities	23,506		—		23,506		—
	Total cash equivalents	43,678		20,172		23,506		—
	Short-term investments
	Commercial paper	75,911		—		75,911		—
	Municipal debt securities	122,325		—		122,325		—
	Corporate debt securities	45,134		—		45,134		—
	Government debt securities	10,008		—		10,008		—
	Total short-term investments	253,378		—		253,378		—
	Long-term investments
	Municipal debt securities	36,037		—		36,037		—
	Total long-term investments	36,037		—		36,037		—
	Total investment securities	$	333,093	$	20,172	$	312,921	$	—
				Fair Value Measurements at Reporting Date Using
	Description	31-Dec-12		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Cash equivalents
	Money market funds	$	3,689	$	3,689	$	—	$	—
	Commercial paper	370		—		370		—
	Municipal debt securities	70,245		—		70,245		—
	Total cash equivalents	74,304		3,689		70,615		—
	Short-term investments
	Certificates of deposit	5,863		—		5,863		—
	Commercial paper	81,767		—		81,767		—
	Municipal debt securities	106,207		—		106,207		—
	Corporate debt securities	33,297		—		33,297		—
	Government debt securities	12,005		—		12,005		—
	Total short-term investments	239,139		—		239,139		—
	Long-term investments
	Municipal debt securities	14,022		—		14,022		—
	Government debt securities	10,008		—		10,008		—
	Total long-term investments	24,030		—		24,030		—
	Total investment securities	$	337,473	$	3,689	$	333,784	$	—
	There were no significant transfers between Level 1 and Level 2 assets for the years ended December 31, 2013 or 2012.
	The Company has determined the estimated fair value of its debt to be Level 3 as certain inputs used are unobservable. The fair value of the Company's debt was estimated using either indicative pricing from market information or the discounted amount of future cash flows. The discounted cash flows use the current rates available to the Company for debt of the same remaining maturities and consideration of default and credit risk. As of December 31, 2013, the estimated fair value and the carrying value of its debt, including current maturities were $224,850 and $234,300, respectively. As of December 31, 2012, the estimated fair value and the carrying value of its debt, including current maturities were $149,789 and $150,852, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The Company is subject to income taxation in the United States and various state jurisdictions in which it operates. In accordance with income tax reporting accounting standards, the Company recognizes tax benefits or expense on the temporary differences between the financial reporting and tax bases of its assets and liabilities.
	The components of the provision for income taxes are as follows:
		Year Ended December 31,
		2013			2012			2011
	Current:
	Federal	$	52,732		$	36,409		$	16,920
	State	4,114			3,462			2,890
	Total current	56,846			39,871			19,810
	Deferred:
	Federal	(1,811		)	6,082			9,982
	State	(134		)	280			324
	Total deferred	(1,945		)	6,362			10,306
	Total income tax provision	$	54,901		$	46,233		$	30,116
	The Company recorded $1,689, $2,797 and $274 as an increase to additional paid in capital and reduction to taxes payable for certain tax benefits from employee stock-based compensation for the years ended December 31, 2013, 2012 and 2011 respectively.
	Reconciliations of the statutory income tax rate and the Company’s effective tax rate for 2013, 2012 and 2011 are as follows:
		Year Ended December 31,
		2013			2012			2011
	Income tax expense at federal statutory rate	$	51,362		$	43,627		$	27,830
	State income taxes, net of federal income tax benefit	2,654			2,301			1,328
	Other	885			305			958
	Total income tax expense	$	54,901		$	46,233		$	30,116
	The major components of the Company’s net deferred tax assets and liabilities are as follows:
		As of December 31,
		2013						2012
		Assets			Liabilities			Assets			Liabilities
	Current:
	Accrued Vacation	$	895		$	—		$	935		$	—
	Accrued Bonus	4,484			—			—			—
	Prepaid expenses	—			(5,420		)	—			(3,769		)
	State taxes	1,269			—			1,120			—
	Accrued property taxes	919			—			815			—
	Other	2,059			—			1,695			—
	Total current	9,626			(5,420		)	4,565			(3,769		)
	Noncurrent:
	Depreciation	—			(51,750		)	—			(49,687		)
	Goodwill	603			—			717			—
	Stock-based compensation expense	3,711			—			2,118			—
	Federal net operating loss	678			—			—			—
	Other	672			(1,411		)	157			—
	Less: Valuation Allowance	(663		)	—			—			—
	Total noncurrent:	5,001			(53,161		)	2,992			(49,687		)
	Total	$	14,627		$	(58,581	)	$	7,557		$	(53,456	)
	As of December 31, 2013, a subsidiary of the Company recognized a federal net operating loss (“NOL”) carryforward of $1,936. The NOL resulted in a deferred tax asset of $678. The Company assessed the need for a valuation allowance based on the available evidence and recognized a valuation allowance in the amount of $663. The Company anticipates that the federal NOL will expire between 2032 and 2033.
	The Company paid income taxes, net of refunds, of $53,220, $37,937 and $23,507 in 2013, 2012 and 2011 respectively.
	Accounting standards for income taxes utilize a two-step approach for evaluating tax positions. A tax position is recognized if it is more likely than not to be sustained upon examination and  measured as the largest amount of benefit that is more likely than not (greater than 50 percent) to be realized upon settlement.
	If it is subsequently determined that a previously recognized tax position no longer meets the “more likely than not” standard, it is required that the tax position be derecognized. Accounting for income taxes standards specifically prohibit the use of a valuation allowance as a substitute for derecognition of tax positions.
	A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:
		As of December 31,
		2013			2012			2011
	Beginning Balance	—			—			3,619
	Increases for tax position of prior years	—			—			—
	Increases for tax position of current year	—			—			—
	Decreases for tax positions of prior years	—			—			(1,754		)
	Settlements	—			—			—
	Decreases for lapses in statute of limitations	—			—			(1,865		)
	Ending Balance	$	—		$	—		$	—
	For the years ended December 31, 2013, 2012 and 2011 the Company did not recognize a liability for uncertain tax positions. During the third quarter of 2011, the liability recognized for the uncertain tax positions decreased by $3,619 as a result of lapses in statute of limitations, changes in judgment and other items.
	The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense.  During the years ended December 31, 2013, 2012 and 2011, the Company did not recognize interest or penalties on any unrecognized tax benefits.
	The Company files income tax returns in the U.S. federal jurisdiction as well as multiple state jurisdictions.  The Company is not currently under examination by the IRS.  The Company's federal income tax returns for 2011 and 2012 remain open to examination. Various state and local tax returns remain open to examination. The Company believes that any potential assessment would be immaterial.

Related_Party_Transactions_Not

Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2011
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	The building where the Company maintains its headquarters is leased from a limited liability company in which our Chief Executive Officer owns a significant interest as non-controlling member. The Company leases additional office space for use as its training facility which is located in a building adjacent to the Company’s headquarters. The second building is also owned by a limited liability company in which the Company's Chief Executive Officer owns a significant interest as non-controlling member.  Under the terms of these agreements, the Company made rent payments of $4,811, $2,303 and $2,284 in 2013, 2012 and 2011, respectively.
	During 2013, the Company paid $938 in marketing expenses related to sponsorship of GMS Racing LLC, formerly known as Gallagher Motorsports. Of the total amount paid, $187 related to expenses recognized in the fourth quarter of 2013 and the remaining amount will be amortized quarterly through the end of 2014. GMS Racing LLC competes in the NASCAR Camping World Truck Series and ARCA Racing Series. The Company's Chief Executive Officer owns a controlling interest in GMS Racing LLC.

Financial_Instruments_and_Risk

Financial Instruments and Risk Management (Notes)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Financial Instruments And Risk Management	'
	Financial Instruments and Risk Management
	The Company’s debt with a carrying value of $234,300 and $150,852 as of December 31, 2013 and 2012, respectively, approximates fair value. The fair value of the Company's long-term debt was estimated using discounted cash flow assumptions based on the current rates available to the Company for debt of the same remaining maturities and consideration of default and credit risk.
	The carrying amounts of cash, cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value due to their short term nature.

Employee_Benefit_Plans_Notes

Employee Benefit Plans (Notes)	12 Months Ended
	Dec. 31, 2013
Employee Benefit Plans [Abstract]	'
Employee Benefit Plans	'
	Employee Benefit Plans
	401(k) Plan
	The Company has a defined contribution plan covering all eligible employees. Under the plan, employees may contribute up to 90 percent of their eligible annual compensation with the Company making matching contributions on employee deferrals of up to 5 percent of eligible employee wages.  The Company recognized expense under this plan of $2,879, $2,537 and $2,002 for the years ended December 31, 2013, 2012 and 2011, respectively.
	Stock-based employee compensation
	In 2006, the Board of Directors adopted, and the stockholders approved, a Long-Term Incentive Plan (the “2006 Plan”) and reserved 3,000,000 shares of common stock for the Company to grant stock options, restricted stock, SARs and other stock-based awards to certain officers, directors, employees, and consultants of the Company. The 2006 Plan is administered by the Company’s compensation committee of the Board of Directors. Upon the merger of Allegiant Travel Company, LLC into Allegiant Travel Company (a Nevada corporation) immediately prior to the Company’s initial public offering, all outstanding stock options under the previously adopted share option program (the “Share Option Program”) were transferred to the 2006 Plan. In addition, no further option grants may be made under the predecessor company’s Share Option Program. The transferred options continue to be governed by their existing terms, unless the compensation committee elects to extend one or more features of the 2006 Plan to those options.
	Compensation expense
	For the years ended December 31, 2013, 2012 and 2011, the Company recorded compensation expense of $9,818, $4,069 and $4,735 respectively, in the consolidated statements of income related to stock options, SARs (stock-settled and cash-settled) and restricted stock.
	The unrecognized compensation cost and weighted-average period over which the cost is expected to be recognized for nonvested awards as of December 31, 2013 are presented below:
		Unrecognized Compensation Cost		Weighted Average Period (years)
	Restricted stock	6,132		1.89
	Cash-settled SARs	2,234		1.76
	Stock options	1,449		2.17
	Total	9,815		1.9
	Fair value
	The fair value of stock options, cash-settled SARs and stock-settled SARs granted were estimated as of the grant date using the Black-Scholes option-pricing model.
	Cash-settled SARs are liability-based awards and the fair value and compensation expense recognized for these awards are updated each reporting period.  The following assumptions used in the Black-Scholes option-pricing model were considered to determine the updated fair value at the years ended:
		2013		2012		2011
	Weighted-average volatility	30.49	%	33.62	%	58.32	%
	3/25/11 Grant
	Expected term (in years)	0.3		1.5		2.6
	Risk-free interest rate	0.28	%	0.45	%	0.8	%
	Expected dividends	—		—		—
	3/8/13 Grant
	Expected term (in years)	2.5		0		0
	Risk-free interest rate	0.54	%	—		—
	Expected dividends	—		—		—
	Expected volatilities used for award valuation in 2013, 2012 and 2011 were based on the historical volatility of the Company’s own common stock.
	Expected term represents the weighted average time between the award’s grant date and its exercise date. The Company estimated its expected term assumption in 2013, 2012 and 2011 using historical award exercise activity and employee termination activity.
	The risk-free interest rate for periods equal to the expected term of the award is based on a blended historical rate using Federal Reserve rates for U.S. Treasury securities.
	The contractual terms of the Company’s stock option and SAR awards granted range from five to ten years.
	Stock options and stock-settled SARs
	A summary of option and stock-settled SARs activity as of December 31, 2013 and changes during the year then ended is presented below:
		Options and Stock-Settled SARs		Weighted Average Exercise Price			Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
	Outstanding at January 1, 2013	228,690		$	36.89
	Granted	108,041		81.77
	Exercised	(53,100	)	38.03
	Forfeited	—		—
	Outstanding at December 31, 2013	283,631		$	49.48		3.38	$	14,507
	During 2013, the Company issued 108,041 stock options at a weighted average exercise price of $81.77. No stock options or stock-settled SARs were granted during the years ended December 31, 2012 or 2011.  During the years ended December 31, 2013, 2012 and 2011, the total intrinsic value of options and SARs exercised was $3,261, $9,123 and $1,407 respectively. Cash received from option exercises for the years ended December 31, 2013, 2012 and 2011 was $2,083, $7,542 and $1,834, respectively.
	Restricted stock awards
	A summary of the status of the Company’s nonvested restricted stock grants during the year ended December 31, 2013 is presented below:
		Shares		Weighted Average Grant Date Fair Value
	Nonvested at December 31, 2012	128,029		$	52.63
	Granted	85,196		84.36
	Vested	(64,426	)	52.57
	Forfeited	(3,567	)	82.87
	Nonvested at December 31, 2013	145,232		$	62.61
	The weighted average grant date fair value per share of restricted stock grants during the years ended December 31, 2013, 2012 and 2011 was $84.36, $55.09 and $43.32, respectively.  The total fair value of restricted stock vested during the years ended December 31, 2013, 2012 and 2011 was $7,187, $2,537 and $2,131, respectively.
	Cash-settled stock appreciation rights
	A summary of cash-settled SARs awards activity during the year ended December 31, 2013 is presented below:
	3/25/11 Grant	Cash-Settled SARs		Weighted Average Grant Date Fair Value
	Outstanding at January 1, 2013	97,109		$	19.01
	Granted	—		—
	Vested	(29,098	)	19.01
	Forfeited	(307	)	19.01
	Outstanding at December 31, 2013	67,704		$	19.01
	Exercisable at December 31, 2013	7,363		19.01
	3/8/13 Grant
	Outstanding at January 1, 2013	—		$	—
	Granted	70,812		20.92
	Vested	—		—
	Forfeited	—		—
	Outstanding at December 31, 2013	70,812		$	20.92
Exercisable at December 31, 2013	—		—
There were 70,812 cash-settled SARs were granted during 2013 and none in 2012.  The weighted average grant date fair value per share of cash-settled SARs granted during the years ended December 31, 2013 and 2011 was $20.92 and $19.01, respectively. As of December 31, 2013, the fair value of the liability related to the outstanding cash-settled SARs was $1,656.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	The Company is subject to certain legal and administrative actions it considers routine to its business activities. The Company believes the ultimate outcome of any pending legal or administrative matters will not have a material adverse impact on its financial position, liquidity or results of operations.
	In December 2012, the Company entered into purchase agreements for seven Airbus A320 aircraft. In August 2013, the Company entered into purchase agreements for two additional Airbus A320 aircraft.  Of the nine aircraft under contract, two were acquired in the second quarter of 2013 and five were acquired in the third quarter of 2013. As of December 31, 2013, the contractual obligations for the two remaining aircraft under contract were $23,360 to be paid in 2014 upon taking ownership of the aircraft.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited) (Notes)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Information	'
	Selected Quarterly Financial Data (Unaudited)
	Quarterly results of operations for the years ended December 31, 2013 and 2012 are summarized below.
		31-Mar		30-Jun		30-Sep		31-Dec
	2013
	Operating revenues	$	272,959	$	255,846	$	228,874	$	238,471
	Operating income	52,367		42,856		29,232		30,281
	Net income attributable to Allegiant Travel Company	31,932		25,760		17,106		17,476
	Earnings per share to common stockholders:
	Basic	1.66		1.35		0.91		0.96
	Diluted	1.65		1.34		0.91		0.94
	2012
	Operating revenues	$	237,851	$	231,166	$	216,864	$	222,838
	Operating income	36,311		41,868		28,748		25,377
	Net income attributable to Allegiant Travel Company	21,703		25,183		16,945		14,766
	Earnings per share to common stockholders:
	Basic	1.13		1.31		0.88		0.78
	Diluted	1.12		1.3		0.87		0.76
	The sum of the quarterly earnings per share amounts does not equal the annual amount reported since per share amounts are computed independently for each quarter and for the full year based on respective weighted average common shares outstanding and other dilutive potential common shares.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies - (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Presentation [Policy Text Block]	'
	Basis of Presentation: The accompanying consolidated financial statements include the accounts of Allegiant Travel Company and its majority-owned operating subsidiaries. The Company's investments in unconsolidated affiliates which are 50% or less owned are accounted for under the equity method. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Due to the prospective nature of these estimates, actual results could differ from those estimates.
Cash and Cash Equivalents, Policy [Policy Text Block]	'
	Cash and Cash Equivalents
	Cash and cash equivalents include investments and interest bearing instruments with maturities of three months or less at the date of acquisition. Such investments are carried at cost which approximates fair value.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	'
	Restricted Cash
	Restricted cash represents escrowed funds under fixed fee contracts, cash collateral against notes payable and cash collateral against letters of credit required by hotel properties for guaranteed room availability, airports and certain other parties.
Receivables, Policy [Policy Text Block]	'
	Accounts Receivable
	Accounts receivable are carried at cost which approximates fair value. They consist primarily of amounts due from credit card companies associated with the sale of tickets for future travel, and amounts due related to fixed fee charter agreements.  If deemed necessary, the Company records an allowance for doubtful accounts for amounts not expected to be collected. The Company did not record allowance for doubtful accounts as of December 31, 2013, and 2012. In addition, accounts receivable write offs for the years ended December 31, 2013, 2012, and 2011 were immaterial.
Marketable Securities, Policy [Policy Text Block]	'
	Investment Securities
	The Company’s investments in marketable securities are classified as available-for-sale and are reported at fair market value with the net unrealized gain or (loss) reported as a component of accumulated other comprehensive income in stockholders’ equity. Investment securities are classified as cash equivalents, short-term investments and long-term investments based on maturity date.  Cash equivalents have maturities of three months or less, short-term investments have maturities of greater than three months but equal to or less than one year and long-term investments are those with a maturity date greater than one year.  As of December 31, 2013, the Company’s long-term investments consisted of government debt securities and municipal debt securities with contractual maturities of less than 18 months.  Investment securities consisted of the following:
		As of December 31, 2013											As of December 31, 2012
					Gross Unrealized										Gross Unrealized
		Cost			Gains			(Losses)			Market Value		Cost		Gains		(Losses)			Market Value
	Money market funds	$	20,172		$	—		$	—		$	20,172	$	3,689	$	—	$	—		$	3,689
	Certificates of deposit	—			—			—			—		5,862		1		—			5,863
	Commercial paper	75,905			8			(2		)	75,911		82,163		16		(42		)	82,137
	Municipal debt securities	181,870			17			(19		)	181,868		190,507		—		(33		)	190,474
	Government debt securities	10,008			—			—			10,008		22,011		2		—			22,013
	Corporate debt securities	45,150			—			(16		)	45,134		33,310		—		(13		)	33,297
	Total	$	333,105		$	25		$	(37	)	$	333,093	$	337,542	$	19	$	(88	)	$	337,473
	The amortized cost of investment securities sold is determined by the specific identification method with any realized gains or losses reflected in other (income) expense.  The Company had minimal realized losses during the years ended December 31, 2013 and 2012 and no realized gains or losses during the year ended December 31, 2011.
	The Company believes unrealized losses related to debt securities are not other-than-temporary.
Inventory, Policy [Policy Text Block]	'
	Expendable Parts, Supplies and Fuel
	Expendable parts, supplies and fuel inventories are valued at cost using the first-in, first-out method. Such inventories are charged to expense as they are used in operations.  An allowance for obsolescence on aircraft spare parts is recognized over the remaining useful life of the Company’s aircraft fleet.
Internal Use Software, Policy [Policy Text Block]	'
	Software Capitalization
	The Company capitalizes certain internal and external costs related to the acquisition and development of computer software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which typically ranges from three to five years.  The Company had unamortized computer software development costs of $20,136 and $16,233 as of December 31, 2013 and 2012, respectively.  Amortization expense related to computer software was $3,347, $1,539 and $986 for the years ended December 31, 2013, 2012 and 2011, respectively.  Costs incurred during the preliminary and post-implementation stages of software development are expensed as incurred.
Property, Plant and Equipment, Policy [Policy Text Block]	'
	Property and Equipment
	Property and equipment are recorded at cost and depreciated using the straight-line method to their estimated residual values over their estimated useful lives as follows:
	Aircraft and engines (years)	15-Jan
	Rotable parts (years)	7
	Ground equipment and leasehold improvements (years)	7-Mar
	Aircraft and engines have an estimated average residual value of 14.7 percent of original cost; other property and equipment are assumed to have no residual value.
	In estimating the useful lives and residual values of its aircraft, the Company primarily has relied upon actual experience with the same or similar aircraft types, current and projected future market information, and recommendations from aircraft manufacturers.  Subsequent revisions to these estimates could be caused by changing market prices of the Company’s aircraft, changes in utilization of the aircraft, and other fleet events.  These estimates are evaluated each reporting period and adjusted if necessary. Changes in the estimate for useful lives or residual values of the Company’s property and equipment could result an acceleration of depreciation expense.
Leased Aircraft Return Costs, Policy [Policy Text Block]	'
	Leased Aircraft Return Costs
	The Company is party to operating lease agreements which contain aircraft return provisions.  These provisions require the Company to compensate the lessor based on specific time remaining on certain aircraft and engine components between scheduled maintenance events.  A liability associated with returning leased aircraft is accrued when it is probable that a cash payment will be made and that amount is reasonably estimable.  Any accrual is based on the time remaining on the lease, planned aircraft usage and other provisions included in the lease agreement, although the actual amount due to any lessor upon return will not be known with certainty until lease termination. As of December 31, 2013 the Company has accrued $1.4 million in leased return conditions.
Equity Method Investments, Policy [Policy Text Block]	'
	Investment in Unconsolidated Affiliates
	The Company uses the equity method to account for AFH Inc.’s, a wholly-owned subsidiary, investment in a fuel venture. AFH, Inc. has a 50 percent interest in a jointly owned entity with OSI (an affiliate of the Orlando Sanford International Airport) to handle certain fuel operations for the Orlando Sanford International Airport. The entity, SFB Fueling LLC, is responsible for the purchase and transport of jet fuel to a fuel farm facility owned and operated by OSI, and for the sale of jet fuel to air carriers at the Orlando Sanford International Airport. In addition, AFH, Inc. is responsible for the administrative functions for the joint venture. The Company’s proportionate allocation of net income or loss from this investment and from an investment in an aviation services company are reported in the Company’s consolidated statements of income in other (income) expense, with an adjustment to the recorded investment in the Company’s consolidated balance sheet. These investments treated under the equity method are not material to the financial position or results of operations of the Company.
Interest Capitalization, Policy [Policy Text Block]	'
	Capitalized Interest
	Interest attributable to funds used to finance the refurbishment of aircraft prior to revenue service is capitalized as an additional cost of the related asset provided the refurbishment is extensive or requires an extended period of time to complete, generally longer than 90 days. Interest is capitalized at the Company’s average interest rate on long-term debt and ceases when the asset is ready for service. For the years ended December 31, 2013, 2012 and 2011, respectively, the Company recorded gross interest expense of $9,616, $9,237 and $7,580, of which $123, $498 and $405 respectively, was capitalized.
Measurement of Impairment of Long-Lived Assets, Policy [Policy Text Block]	'Measurement of Impairment of Long-Lived AssetsB The Company records impairment losses on long-lived assets used in operations, consisting principally of property and equipment, when events or changes in circumstances indicate, in managementbs judgment, that the assets might be impaired and the undiscounted future cash flows estimated to be generated by those assets are less than the carrying amount of those assets.B B In making these determinations, the Company utilizes certain assumptions, including, but not limited to: (i) estimated fair market value of the assets; and (ii) estimated future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service the asset will be used in operations, and estimated salvage values.For the years ended December 31, 2013, 2012 and 2011, the Company incurred impairment losses on spare engine parts of $5,315, $2,768 and $2,486, respectively.
Revenue Recognition, Policy [Policy Text Block]	'
	Revenue Recognition
	Scheduled service revenue consists of passenger revenue generated from nonstop flights in the Company’s route network recognized when the travel-related service or transportation is provided or when the itinerary expires unused. Nonrefundable scheduled itineraries expire on the date of the intended flight, unless the date is extended by notification from the customer in advance. Itineraries sold for transportation, but not yet used, as well as unexpired credits, are included in air traffic liability.
	Various taxes and fees assessed on the sale of tickets to customers are collected by the Company as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the Company’s consolidated statements of income and recorded as a liability until remitted to the appropriate taxing authority.
	Fixed fee contract revenue consists largely of agreements to provide charter service on a year-round and ad hoc basis.  Fixed fee contract revenue is recognized when the transportation is provided.
	Ancillary revenue is generated from air-related fees paid by ticketed passengers and the sale of third party products. Air-related charges consists of baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services.  Revenues from air-related charges are recognized when the transportation is provided if the product is not deemed independent of the original ticket sale.  Change and cancellation fees to nonrefundable itineraries are air-related charges deemed independent of the original ticket sale and are recognized as revenue as they occur.
	Ancillary revenue is also generated from the sale of third party products such as hotel rooms, rental cars, ticket attractions, and other items. Revenues from the sale of third party products are recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows accounting standards for revenue arrangements with multiple deliverables to determine the amount of revenue to be recognized for each element of a bundled sale involving air-related charges and third party products in addition to airfare. Revenue from the sale of third party products is recorded net of amounts paid to wholesale providers, travel agent commissions, and transaction costs.
	Other revenue is generated from leased out aircraft and flight equipment and other miscellaneous sources. Lease revenue is recognized on a straight-line basis over the lease term.
Maintenance and Repair Costs, Policy [Policy Text Block]	'Maintenance and Repair CostsB The Company accounts for aircraft maintenance activities under the direct expense method. Under this method, maintenance and repair costs for owned and leased aircraft, including major aircraft maintenance activities, are charged to operating expenses as incurred.
Advertising Costs, Policy [Policy Text Block]	'
	Advertising Costs
	Advertising costs are charged to expense in the period incurred. Advertising expense was $4,160, $4,201 and $5,159 for the years ended December 31, 2013, 2012 and 2011, respectively.
Earnings Per Share, Policy [Policy Text Block]	'
	Earnings per Share
	Basic and diluted earnings per share are computed pursuant to the two-class method. Under this method, the Company attributes net income to two classes, common stock and unvested restricted stock awards. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities as they receive non-forfeitable rights to cash dividends at the same rate as common stock.
	Diluted net income per share is calculated using the more dilutive of two methods. Under both methods, the exercise of employee stock options and stock-settled stock appreciation rights are assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs:
	1	Assume vesting of restricted stock using the treasury stock method.
	2	Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method.
	For the years ended December 31, 2013, 2012 and 2011, the second method above which assumes unvested awards are not vested was used in the computation because it was more dilutive than the first method above which assumes vesting of awards using the treasury stock method.  The following table sets forth the computation of net income per share on a basic and diluted basis for the periods indicated (shares in table below in thousands):
		Year ended December 31,
		2013			2012			2011
	Basic:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(381		)	(295		)	(283		)
	Net income attributable to common stock	$	91,892		$	78,302		$	49,115
	Net income per share, basic	$	4.85		$	4.1		$	2.59
	Weighted-average shares outstanding	18,936			19,079			18,935
	Diluted:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(378		)	(292		)	(280		)
	Net income attributable to common stock	$	91,895		$	78,305		$	49,118
	Net income per share, diluted	$	4.82		$	4.06		$	2.57
	Weighted-average shares outstanding	18,936			19,079			18,935
	Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	154			228			209
	Adjusted weighted-average shares outstanding under treasury stock method	19,090			19,307			19,144
	Participating securities excluded under two-class method	(40		)	(31		)	(19		)
	Adjusted weighted-average shares outstanding under two-class method	19,050			19,276			19,125
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	'
	Stock-Based Compensation
	The Company accounts for stock-based compensation in accordance with accounting standards which require the compensation cost relating to share-based payment transactions be recognized in the Company’s consolidated statements of income. The cost is measured at the grant date, based on the calculated fair value of the award using the Black-Scholes option pricing model for stock options and stock appreciation rights (“SARs”), and based on the closing share price of the Company’s stock on the grant date for restricted stock awards. The cost is recognized as an expense over the employee’s requisite service period (the vesting period of the award). The vesting period of the Company’s awards is generally three years. The Company’s stock-based employee compensation plan is more fully discussed in Note 12—Employee Benefit Plans.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	'
	Concentration Risk
	The Company attempts to minimize its concentration risk with regard to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security, commercial paper, or money market fund.
Income Tax, Policy [Policy Text Block]	'
	Income Taxes
	The Company recognizes deferred income taxes based on the asset and liability method required by ASC 740. Deferred tax assets and liabilities are determined based on the timing differences between book basis for financial reporting purposes and tax basis of the asset and liability and measured using the enacted tax rates. A valuation allowance for deferred tax assets is provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company determines the net current and non-current deferred tax assets or liabilities separately for federal, state, and other local jurisdictions.
	The Company’s income tax returns are subject to examination by the Internal Revenue Service (“IRS”) and other tax authorities in the jurisdictions where the Company operates. The Company assesses potentially unfavorable outcomes of such examinations based on the criteria set forth in uncertain tax position accounting standards. The accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements.
	Accounting standards for income taxes utilize a two-step approach for evaluating tax positions. Recognition (Step I) occurs when the Company concludes that a tax position, based on its technical merits, is more likely than not to be sustained upon examination. Measurement (Step II) is only addressed if the position is deemed to be more likely than not to be sustained. Under Step II, the tax benefit is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement.
	The tax positions failing to qualify for initial recognition are recognized in the first subsequent interim period they meet the “more likely than not” standard. If it is subsequently determined that a previously recognized tax position no longer meets the “more likely than not” standard, it is required that the tax position be derecognized. As applicable, the Company will recognize accrued penalties and interest related to unrecognized tax benefits in the provision for income taxes.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Unrealized Gain (Loss) on Investments	'
	Investment securities consisted of the following:
		As of December 31, 2013											As of December 31, 2012
					Gross Unrealized										Gross Unrealized
		Cost			Gains			(Losses)			Market Value		Cost		Gains		(Losses)			Market Value
	Money market funds	$	20,172		$	—		$	—		$	20,172	$	3,689	$	—	$	—		$	3,689
	Certificates of deposit	—			—			—			—		5,862		1		—			5,863
	Commercial paper	75,905			8			(2		)	75,911		82,163		16		(42		)	82,137
	Municipal debt securities	181,870			17			(19		)	181,868		190,507		—		(33		)	190,474
	Government debt securities	10,008			—			—			10,008		22,011		2		—			22,013
	Corporate debt securities	45,150			—			(16		)	45,134		33,310		—		(13		)	33,297
	Total	$	333,105		$	25		$	(37	)	$	333,093	$	337,542	$	19	$	(88	)	$	337,473
Estimated Useful Lives	'
	Property and equipment are recorded at cost and depreciated using the straight-line method to their estimated residual values over their estimated useful lives as follows:
	Aircraft and engines (years)	15-Jan
	Rotable parts (years)	7
	Ground equipment and leasehold improvements (years)	7-Mar
Schedule of Earnings Per Share, Basic and Diluted	'
	The following table sets forth the computation of net income per share on a basic and diluted basis for the periods indicated (shares in table below in thousands):
		Year ended December 31,
		2013			2012			2011
	Basic:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(381		)	(295		)	(283		)
	Net income attributable to common stock	$	91,892		$	78,302		$	49,115
	Net income per share, basic	$	4.85		$	4.1		$	2.59
	Weighted-average shares outstanding	18,936			19,079			18,935
	Diluted:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(378		)	(292		)	(280		)
	Net income attributable to common stock	$	91,895		$	78,305		$	49,118
	Net income per share, diluted	$	4.82		$	4.06		$	2.57
	Weighted-average shares outstanding	18,936			19,079			18,935
	Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	154			228			209
	Adjusted weighted-average shares outstanding under treasury stock method	19,090			19,307			19,144
	Participating securities excluded under two-class method	(40		)	(31		)	(19		)
	Adjusted weighted-average shares outstanding under two-class method	19,050			19,276			19,125
		Year ended December 31,
		2013			2012			2011
	Basic:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(381		)	(295		)	(283		)
	Net income attributable to common stock	$	91,892		$	78,302		$	49,115
	Net income per share, basic	$	4.85		$	4.1		$	2.59
	Weighted-average shares outstanding	18,936			19,079			18,935
	Diluted:
	Net income attributable to Allegiant Travel Company	$	92,273		$	78,597		$	49,398
	Less: Net income allocated to participating securities	(378		)	(292		)	(280		)
	Net income attributable to common stock	$	91,895		$	78,305		$	49,118
	Net income per share, diluted	$	4.82		$	4.06		$	2.57
	Weighted-average shares outstanding	18,936			19,079			18,935
	Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	154			228			209
	Adjusted weighted-average shares outstanding under treasury stock method	19,090			19,307			19,144
	Participating securities excluded under two-class method	(40		)	(31		)	(19		)
	Adjusted weighted-average shares outstanding under two-class method	19,050			19,276			19,125

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Schedule Of Property Plant And Equipment	'
	Property and equipment consist of the following:
		As of December 31,			As of December 31,
		2013			2012
	Flight equipment	$	629,715		$	515,501
	Ground property and equipment	73,638			43,318
	Total property and equipment	703,353			558,819
	Less accumulated depreciation and amortization	(251,769		)	(207,615		)
	Property and equipment, net	$	451,584		$	351,204
Types of Commercial Aircraft [Table Text Block]	'
	The following table summarizes the Company's total aircraft fleet as of December 31, 2013:
	Aircraft Type		Owned (1)		Leased			Total	Seating Capacity	Average Age
									(per aircraft)	in Years
	MD-88/82/83 (2)		54		—			54	150/166	24
	B757-200		6		—			6	223	20.8
	A319		1		2			3	156	9.2
	A320 (3)		7		—			7	177	13.2
	Total aircraft		68		2			70

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Payables and Accruals [Abstract]	'
Schedule of Accrued Liabilities	'
	Accrued liabilities consist of the following:
		As of December 31,		As of December 31,
		2013		2012
	Salaries, wages and benefits	$	23,355	$	11,827
	Maintenance and repairs	3,166		8,632
	Passenger fees payable	5,638		4,934
	Passenger taxes payable	948		917
	Station expenses	8,257		8,935
	Interest payable	723		522
	Dividend payable	41,787		—
	Other accruals	3,329		709
	Total accrued liabilities	$	87,203	$	36,476

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Summary of Long-Term Debt	'
	Long-term debt consisted of the following:
		As of December 31, 2013		As of December 31, 2012
	Senior secured term loan facility, interest at LIBOR plus 4.25% with LIBOR floor of 1.5%, due March 2017	$	121,230	$	122,376
	Notes payable, secured by aircraft, interest at LIBOR plus 2.46%, due November 2019	48,000		—
	Notes payable, secured by real estate, interest at 2.86%, due October 2018	9,953		—
	Notes payable, secured by aircraft, interest at 3.99%, due October 2018	45,775		—
	Notes payable, secured by aircraft, interest at 4.65%, due July 2016	9,342		12,668
	Notes payable, secured by aircraft, interest at 4.95%, due October 2015	—		5,102
	Notes payable, secured by aircraft, interest at 6.28%, due March 2015	—		4,150
	Notes payable, secured by aircraft, interest at 6.26%, due August 2014	—		6,556
	Total long-term debt	234,300		150,852
	Less current maturities	20,237		11,623
	Long-term debt, net of current maturities	$	214,063	$	139,229

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases	'
		Aircraft Leases		Property Facility Leases		Operating Leases
	2014	$	3,798	$	5,480	$	9,278
	2015	12,259		4,072		17,691
	2016	15,792		2,710		20,918
	2017	15,792		—		18,302
	2018	15,792		—		16,258
	Thereafter	60,296		—		60,359
	Total	$	123,729	$	12,262	$	142,806

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Assets Measured at Fair Value On a Recurring Basis	'
	Assets measured at fair value on a recurring basis at December 31, 2013 and December 31, 2012 were as follows:
				Fair Value Measurements at Reporting Date Using
	Description	December 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Cash equivalents
	Money market funds	$	20,172	$	20,172	$	—	$	—
	Municipal debt securities	23,506		—		23,506		—
	Total cash equivalents	43,678		20,172		23,506		—
	Short-term investments
	Commercial paper	75,911		—		75,911		—
	Municipal debt securities	122,325		—		122,325		—
	Corporate debt securities	45,134		—		45,134		—
	Government debt securities	10,008		—		10,008		—
	Total short-term investments	253,378		—		253,378		—
	Long-term investments
	Municipal debt securities	36,037		—		36,037		—
	Total long-term investments	36,037		—		36,037		—
	Total investment securities	$	333,093	$	20,172	$	312,921	$	—
				Fair Value Measurements at Reporting Date Using
	Description	31-Dec-12		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Cash equivalents
	Money market funds	$	3,689	$	3,689	$	—	$	—
	Commercial paper	370		—		370		—
	Municipal debt securities	70,245		—		70,245		—
	Total cash equivalents	74,304		3,689		70,615		—
	Short-term investments
	Certificates of deposit	5,863		—		5,863		—
	Commercial paper	81,767		—		81,767		—
	Municipal debt securities	106,207		—		106,207		—
	Corporate debt securities	33,297		—		33,297		—
	Government debt securities	12,005		—		12,005		—
	Total short-term investments	239,139		—		239,139		—
	Long-term investments
	Municipal debt securities	14,022		—		14,022		—
	Government debt securities	10,008		—		10,008		—
	Total long-term investments	24,030		—		24,030		—
	Total investment securities	$	337,473	$	3,689	$	333,784	$	—

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit)	'
	The components of the provision for income taxes are as follows:
		Year Ended December 31,
		2013			2012			2011
	Current:
	Federal	$	52,732		$	36,409		$	16,920
	State	4,114			3,462			2,890
	Total current	56,846			39,871			19,810
	Deferred:
	Federal	(1,811		)	6,082			9,982
	State	(134		)	280			324
	Total deferred	(1,945		)	6,362			10,306
	Total income tax provision	$	54,901		$	46,233		$	30,116
Schedule of Effective Income Tax Rate Reconciliation	'
	Reconciliations of the statutory income tax rate and the Company’s effective tax rate for 2013, 2012 and 2011 are as follows:
		Year Ended December 31,
		2013			2012			2011
	Income tax expense at federal statutory rate	$	51,362		$	43,627		$	27,830
	State income taxes, net of federal income tax benefit	2,654			2,301			1,328
	Other	885			305			958
	Total income tax expense	$	54,901		$	46,233		$	30,116
Schedule of Deferred Tax Assets and Liabilities	'
	The major components of the Company’s net deferred tax assets and liabilities are as follows:
		As of December 31,
		2013						2012
		Assets			Liabilities			Assets			Liabilities
	Current:
	Accrued Vacation	$	895		$	—		$	935		$	—
	Accrued Bonus	4,484			—			—			—
	Prepaid expenses	—			(5,420		)	—			(3,769		)
	State taxes	1,269			—			1,120			—
	Accrued property taxes	919			—			815			—
	Other	2,059			—			1,695			—
	Total current	9,626			(5,420		)	4,565			(3,769		)
	Noncurrent:
	Depreciation	—			(51,750		)	—			(49,687		)
	Goodwill	603			—			717			—
	Stock-based compensation expense	3,711			—			2,118			—
	Federal net operating loss	678			—			—			—
	Other	672			(1,411		)	157			—
	Less: Valuation Allowance	(663		)	—			—			—
	Total noncurrent:	5,001			(53,161		)	2,992			(49,687		)
	Total	$	14,627		$	(58,581	)	$	7,557		$	(53,456	)
Summary of Income Tax Contingencies	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:
		As of December 31,
		2013			2012			2011
	Beginning Balance	—			—			3,619
	Increases for tax position of prior years	—			—			—
	Increases for tax position of current year	—			—			—
	Decreases for tax positions of prior years	—			—			(1,754		)
	Settlements	—			—			—
	Decreases for lapses in statute of limitations	—			—			(1,865		)
	Ending Balance	$	—		$	—		$	—

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Employee Benefit Plans [Abstract]	'
Schedule Of Share Based Compensation Unrecognized Compensation Cost	'
	The unrecognized compensation cost and weighted-average period over which the cost is expected to be recognized for nonvested awards as of December 31, 2013 are presented below:
		Unrecognized Compensation Cost		Weighted Average Period (years)
	Restricted stock	6,132		1.89
	Cash-settled SARs	2,234		1.76
	Stock options	1,449		2.17
	Total	9,815		1.9
Schedule Of Share Based Payment Award Valuation Assumptions	'
	The following assumptions used in the Black-Scholes option-pricing model were considered to determine the updated fair value at the years ended:
		2013		2012		2011
	Weighted-average volatility	30.49	%	33.62	%	58.32	%
	3/25/11 Grant
	Expected term (in years)	0.3		1.5		2.6
	Risk-free interest rate	0.28	%	0.45	%	0.8	%
	Expected dividends	—		—		—
	3/8/13 Grant
	Expected term (in years)	2.5		0		0
	Risk-free interest rate	0.54	%	—		—
	Expected dividends	—		—		—
Schedule of Share-based Compensation, Stock Options, Activity	'
	A summary of option and stock-settled SARs activity as of December 31, 2013 and changes during the year then ended is presented below:
		Options and Stock-Settled SARs		Weighted Average Exercise Price			Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value
	Outstanding at January 1, 2013	228,690		$	36.89
	Granted	108,041		81.77
	Exercised	(53,100	)	38.03
	Forfeited	—		—
	Outstanding at December 31, 2013	283,631		$	49.48		3.38	$	14,507
Schedule of Nonvested Restricted Stock Units Activity	'
	A summary of the status of the Company’s nonvested restricted stock grants during the year ended December 31, 2013 is presented below:
		Shares		Weighted Average Grant Date Fair Value
	Nonvested at December 31, 2012	128,029		$	52.63
	Granted	85,196		84.36
	Vested	(64,426	)	52.57
	Forfeited	(3,567	)	82.87
	Nonvested at December 31, 2013	145,232		$	62.61
Schedule Of Cash Settled Stock Appreciation Rights Activity	'
	A summary of cash-settled SARs awards activity during the year ended December 31, 2013 is presented below:
	3/25/11 Grant	Cash-Settled SARs		Weighted Average Grant Date Fair Value
	Outstanding at January 1, 2013	97,109		$	19.01
	Granted	—		—
	Vested	(29,098	)	19.01
	Forfeited	(307	)	19.01
	Outstanding at December 31, 2013	67,704		$	19.01
	Exercisable at December 31, 2013	7,363		19.01
	3/8/13 Grant
	Outstanding at January 1, 2013	—		$	—
	Granted	70,812		20.92
	Vested	—		—
	Forfeited	—		—
	Outstanding at December 31, 2013	70,812		$	20.92
	Exercisable at December 31, 2013	—		—

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
		31-Mar		30-Jun		30-Sep		31-Dec
	2013
	Operating revenues	$	272,959	$	255,846	$	228,874	$	238,471
	Operating income	52,367		42,856		29,232		30,281
	Net income attributable to Allegiant Travel Company	31,932		25,760		17,106		17,476
	Earnings per share to common stockholders:
	Basic	1.66		1.35		0.91		0.96
	Diluted	1.65		1.34		0.91		0.94
	2012
	Operating revenues	$	237,851	$	231,166	$	216,864	$	222,838
	Operating income	36,311		41,868		28,748		25,377
	Net income attributable to Allegiant Travel Company	21,703		25,183		16,945		14,766
	Earnings per share to common stockholders:
	Basic	1.13		1.31		0.88		0.78
	Diluted	1.12		1.3		0.87		0.76

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Accrued Aircraft Lease Return Costs	$1,400	'	'
Advertising Expense	4,160	4,201	5,159
Asset Impairment Charges	5,315	2,768	2,486
Interest Costs Incurred	9,616	9,237	7,580
Interest Costs Capitalized	123	498	405
Capitalized Computer Software, Net	20,136	16,233	'
Capitalized Computer Software, Amortization	$3,347	$1,539	$986
Significant Change in Unrecognized Tax Benefits, Nature of Event	50.00%	'	'

Summary_of_Significant_Account4

Summary of Significant Accounting Policies Investment Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities	'	'
Cost	$333,105	$337,542
Gains	25	19
Losses	-37	-88
Market Value	333,093	337,473
Money Market Funds [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	20,172	3,689
Gains	0	0
Losses	0	0
Market Value	20,172	3,689
Certificates of Deposit [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	0	5,862
Gains	0	1
Losses	0	0
Market Value	0	5,863
Commercial Paper [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	75,905	82,163
Gains	8	16
Losses	-2	-42
Market Value	75,911	82,137
Municipal Bonds [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	181,870	190,507
Gains	17	0
Losses	-19	-33
Market Value	181,868	190,474
US Government Corporations and Agencies Securities [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	10,008	22,011
Gains	0	2
Losses	0	0
Market Value	10,008	22,013
Corporate Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities	'	'
Cost	45,150	33,310
Gains	0	0
Losses	-16	-13
Market Value	$45,134	$33,297

Summary_of_Significant_Account5

Summary of Significant Accounting Policies Property, Plant and Equipment, Salvage Value, Percentage (Details)	12 Months Ended
	Dec. 31, 2013
Aircraft And Engines [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Salvage Value, Percentage	14.70%
Aircraft And Engines [Member] | Minimum [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Estimated Useful Lives	'P1Y
Aircraft And Engines [Member] | Maximum [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Estimated Useful Lives	'P15Y
Rotable Parts [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Estimated Useful Lives	'P7Y
Equipment And Leasehold Improvements [Member] | Minimum [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Estimated Useful Lives	'P3Y
Equipment And Leasehold Improvements [Member] | Maximum [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Estimated Useful Lives	'P7Y

Summary_of_Significant_Account6

Summary of Significant Accounting Policies Earnings per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income (Loss) Attributable to Parent	$17,476	$17,106	$25,760	$31,932	$14,766	$16,945	$25,183	$21,703	$92,273	$78,597	$49,398
Net income attributable to common stock (in Dollars)	'	'	'	'	'	'	'	'	91,892	78,302	49,115
Earnings Per Share, Basic	$0.96	$0.91	$1.35	$1.66	$0.78	$0.88	$1.31	$1.13	$4.85	$4.10	$2.59
Weighted Average Number of Shares Outstanding, Basic	'	'	'	'	'	'	'	'	18,936	19,079	18,935
Net income attributable to common stock (in Dollars)	'	'	'	'	'	'	'	'	91,895	78,305	49,118
Earnings Per Share, Diluted	$0.94	$0.91	$1.34	$1.65	$0.76	$0.87	$1.30	$1.12	$4.82	$4.06	$2.57
Incremental Common Shares Attributable to Share-based Payment Arrangements	'	'	'	'	'	'	'	'	154	228	209
Adjusted weighted-average shares outstanding under treasury stock method	'	'	'	'	'	'	'	'	19,090	19,307	19,144
Participating securities excluded under two-class method	'	'	'	'	'	'	'	'	-40	-31	-19
Two-Class Method, Weighted Average Number of Shares Outstanding, Diluted	'	'	'	'	'	'	'	'	19,050	19,276	19,125
Basic [Member]	'	'	'	'	'	'	'	'	'	'	'
Undistributed Earnings Allocated to Participating Securities	'	'	'	'	'	'	'	'	-381	-295	-283
Diluted [Member]	'	'	'	'	'	'	'	'	'	'	'
Undistributed Earnings Allocated to Participating Securities	'	'	'	'	'	'	'	'	($378)	($292)	($280)

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)

12 Months Ended

12 Months Ended

3 Months Ended

0 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 01, 2014

Dec. 31, 2013

aircraft

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

Boeing 757 [Member]

Boeing 757 [Member]

Airbus A319 [Member]

Airbus A320 Aircraft [Member]

Airbus A320 Aircraft [Member]

Subsequent Event [Member]

Subsequent Event [Member]

aircraft

aircraft

In Service [Member]

aircraft

aircraft

aircraft

aircraft

In Service [Member]

MD-80 Aircraft [Member]

Airbus A320 Aircraft [Member]

aircraft

aircraft

aircraft

In Service [Member]

aircraft

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Number of Aircraft Owned

68

'

54

58

52

6

6

1

7

5

1

2

Flight Equipment, Gross

$629,715

$515,501

'

'

'

'

'

'

'

'

'

'

Ground property and equipment

73,638

43,318

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Gross

703,353

558,819

'

'

'

'

'

'

'

'

'

'

Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment

-251,769

-207,615

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Net

$451,584

$351,204

'

'

'

'

'

'

'

'

'

'

Property_and_Equipment_Total_A

Property and Equipment Total Aircraft Fleet (Details)

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 01, 2014

Dec. 31, 2013

aircraft

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

Boeing 757 [Member]

Boeing 757 [Member]

Boeing 757 [Member]

Airbus A319 [Member]

Airbus A319 [Member]

Airbus A320 Aircraft [Member]

Airbus A320 Aircraft [Member]

In Service [Member]

In Service [Member]

Seat Capacity, 150 [Member]

Not In Service [Member]

Capacity [Member]

Subsequent Event [Member]

Subsequent Event [Member]

aircraft

aircraft

Minimum [Member]

Maximum [Member]

aircraft

aircraft

Maximum [Member]

aircraft

Maximum [Member]

aircraft

Maximum [Member]

MD-80 Aircraft [Member]

Airbus A320 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

MD-80 Aircraft [Member]

In Service [Member]

seats

seats

seats

seats

seats

aircraft

aircraft

aircraft

aircraft

aircraft

aircraft

Airbus A320 Aircraft [Member]

aircraft

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Seating Capacity

'

'

'

150

166

'

'

223

'

156

'

177

'

'

'

'

'

'

'

Number of Aircraft Owned

68

54

58

'

'

6

6

'

1

'

7

'

52

5

1

2

51

1

2

Number of Aircraft Operated

70

54

'

'

'

6

'

'

3

'

7

'

'

'

'

'

'

'

'

Average Age of Aircraft

'

'24 years

'

'

'

'20 years 9 months 18 days

'

'

'9 years 2 months 12 days

'

'13 years 2 months 12 days

'

'

'

'

'

'

'

'

Number Of Aircraft Leased

2

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

Accrued_Liabilities_Details

Accrued Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accrued Liabilities, Current [Abstract]	'	'
Salaries, wages and benefits	$23,355	$11,827
Maintenance and repairs	3,166	8,632
Passenger fees payable	5,638	4,934
Passenger taxes payable	948	917
Station expenses	8,257	8,935
Interest payable	723	522
Dividend payable	41,787	0
Other accruals	3,329	709
Accrued liabilities	$87,203	$36,476

Accrued_Liabilities_Textual_De

Accrued Liabilities Textual (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]	'	'
Accrued Bonuses	'	$12,100
Dividends Payable, Amount Per Share	'	$2.25
Payments of Ordinary Dividends, Common Stock	$41,800	'

LongTerm_Debt_Detail

Long-Term Debt (Detail) (USD $)

3 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 10, 2011

Dec. 31, 2013

Dec. 31, 2012

Oct. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Nov. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Due March 2017 [Member]

Due March 2017 [Member]

Due October 2018 [Member]

Due October 2018 [Member]

Due October 2018 [Member]

Due November 2019 [Member]

Due November 2019 [Member]

Due November 2019 [Member]

Boeing 757 [Member]

Notes Payable, 2.86%, Due October 2018 [Member]

Notes Payable, 3.99%, Due October 2018 [Member]

Notes Payable, 3.99%, Due October 2018 [Member]

Notes Payable, 3.99%, Due October 2018 [Member]

aircraft

Due October 2018 [Member]

Due October 2018 [Member]

Airbus A320 Aircraft [Member]

Airbus A319 [Member]

aircraft

aircraft

Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months

'

$20,133,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Maturities, Repayments of Principal in Year Two

'

20,935,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Maturities, Repayments of Principal in Year Three

'

20,156,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Maturities, Repayments of Principal in Year Four

'

135,285,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Maturities, Repayments of Principal in Year Five

'

24,048,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Maturities, Repayments of Principal after Year Five

'

13,743,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Of Aircraft Used As Collateral

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

3

1

Loan Payable (in Dollars)

'

'

'

125,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument LIBOR Percentage Rate Minimum

'

'

'

'

1.50%

1.50%

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument Periodic Payment Principal Percent

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Company's Excess Cash Flow

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage Ratio

'

1.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured Long-term Debt, Noncurrent

'

234,300,000

150,852,000

'

121,230,000

122,376,000

10,000,000

48,000,000

0

48,000,000

48,000,000

0

'

9,953,000

45,775,000

'

'

Interest Rate

'

'

'

'

4.25%

4.25%

'

'

0.00%

'

2.46%

'

'

2.86%

3.99%

'

'

Repayments of Secured Debt

$10,485,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Components_of_Lo

Long-Term Debt - Components of Long-Term Debt (Detail) (USD $)

3 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Nov. 30, 2013

Dec. 31, 2012

Oct. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Due March 2017 [Member]

Due March 2017 [Member]

Due November 2019 [Member]

Due November 2019 [Member]

Due November 2019 [Member]

Due October 2018 [Member]

Due October 2018 [Member]

Due October 2018 [Member]

Due July 2016 [Member]

Due July 2016 [Member]

Due October 2015 [Member]

Due October 2015 [Member]

Due March 2015 [Member]

Due March 2015 [Member]

Due August 2014 [Member]

Due August 2014 [Member]

Notes Payable, 2.86%, Due October 2018 [Member]

Notes Payable, 2.86%, Due October 2018 [Member]

Notes Payable, 3.99%, Due October 2018 [Member]

Due October 2018 [Member]

Airbus A320 [Member]

Due October 2018 [Member]

aircraft

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured Long-term Debt, Noncurrent

'

$234,300

$150,852

$121,230

$122,376

$48,000

$48,000

$0

$10,000

$48,000

$0

$9,342

$12,668

$0

$5,102

$0

$4,150

$0

$6,556

$9,953

'

$45,775

Number Of Aircraft Used As Collateral

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

Less current maturities

'

20,237

11,623

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, net of current maturities

'

214,063

139,229

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Secured Debt

$10,485

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Parenthetical_De

Long-Term Debt (Parenthetical) (Details)	Dec. 31, 2013	Dec. 31, 2012
Due March 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
DebtInstrumentLIBORPercentageRateMinimum	1.50%	1.50%
Due October 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	0.00%
Due October 2018 [Member] | Notes Payable, 2.86%, Due October 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	2.86%	'
Due October 2018 [Member] | Notes Payable, 3.99%, Due October 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	3.99%	'
Due July 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%
Due October 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	0.00%	4.95%
Due March 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	0.00%	6.28%
Due August 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Stated Percentage	0.00%	6.26%

Leases_Details

Leases (Details) (USD $)	12 Months Ended						3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
	aircraft						Airbus A319 [Member]	Airbus A319 [Member]	Building [Member]
							aircraft	aircraft
Operating Leased Assets [Line Items]	'	'	'	'	'	'	'	'	'
2014	$9,278,000	'	'	'	'	$10,544,000	$3,798,000	$3,798,000	$5,480,000
2015	17,691,000	'	'	10,193,000	10,193,000	'	12,259,000	12,259,000	4,072,000
2016	20,918,000	'	'	'	'	'	15,792,000	15,792,000	2,710,000
2017	18,302,000	'	'	'	'	'	15,792,000	15,792,000	0
2018	16,258,000	'	'	'	'	'	15,792,000	15,792,000	0
Thereafter	60,359,000	'	'	'	'	'	60,296,000	60,296,000	0
Operating Leases, Rent Expense	13,098,000	8,322,000	8,336,000	'	'	'	'	'	'
Aircraft lease rentals	9,227,000	0	1,101,000	'	'	'	'	5,534,000	'
Number Of Aircraft Committed To Purchase	2	'	'	'	'	'	2	9	'
Sub-Service Expense	4,200,000	'	'	'	'	'	'	'	'
Operating Leases, Future Minimum Payments Due	142,806,000	'	'	'	'	'	123,729,000	123,729,000	12,262,000
Leasehold Improvements, Gross	$1,400,000	'	'	'	'	'	'	'	'

Leases_Future_Minimum_Lease_Pa

Leases Future Minimum Lease Payments Under Operating Leases (Details) (USD $)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leased Assets [Line Items]	'	'	'	'
2014	'	'	$10,544	$9,278
2015	10,193	10,193	'	17,691
2016	'	'	'	20,918
2017	'	'	'	18,302
2018	'	'	'	16,258
Thereafter	'	'	'	60,359
Operating Leases, Future Minimum Payments Due	'	'	'	142,806
Building [Member]	'	'	'	'
Operating Leased Assets [Line Items]	'	'	'	'
2014	'	'	'	5,480
2015	'	'	'	4,072
2016	'	'	'	2,710
2017	'	'	'	0
2018	'	'	'	0
Thereafter	'	'	'	0
Operating Leases, Future Minimum Payments Due	'	'	'	12,262
Airbus A319 [Member]	'	'	'	'
Operating Leased Assets [Line Items]	'	'	'	'
2014	'	'	'	3,798
2015	'	'	'	12,259
2016	'	'	'	15,792
2017	'	'	'	15,792
2018	'	'	'	15,792
Thereafter	'	'	'	60,296
Operating Leases, Future Minimum Payments Due	'	'	'	$123,729

Stockholders_Equity_Detail

Stockholders' Equity (Detail) (USD $)	12 Months Ended					0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jan. 03, 2014
				Open Market Purchases	Open Market Purchases	Subsequent Event [Member]
Stock Repurchased During Period, Shares (in Shares)	913,806	54,730	34,323	'	'	'
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$91.33	$72.73	$43.49	'	'	'
Treasury Stock, Carrying Basis	'	'	$1,493	'	'	'
Payments for Repurchase of Common Stock	83,607	4,994	1,922	83,462	3,981	'
Stock Repurchase Program, Remaining Authorized Repurchase Amount	39,814	'	'	'	'	'
Dividends Paid Common And Restricted Stock (Per share)	$2.25	$2	'	'	'	'
Dividends Paid Common And Restricted Stock (Per share)	$0	$38,602	$0	'	'	$41,787

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Debt Instrument, Fair Value Disclosure	$224,850	$149,789
Long-term Debt, Fair Value	$234,300	$150,852

Fair_Value_Measurements_Detail1

Fair Value Measurements (Detail) - Fair Value Measurements at Reporting Date Using (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investment Securities	$333,093	$337,473
Estimate of Fair Value	'	'
Investment Securities	333,093	337,473
Estimate of Fair Value | Cash equivalents	'	'
Cash Equivalents	43,678	74,304
Estimate of Fair Value | Short-term investments	'	'
Investment Securities	253,378	239,139
Estimate of Fair Value | Long-term investments	'	'
Investment Securities	36,037	24,030
Fair Value, Inputs, Level 1	'	'
Investment Securities	20,172	3,689
Fair Value, Inputs, Level 1 | Cash equivalents	'	'
Cash Equivalents	20,172	3,689
Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	0	0
Fair Value, Inputs, Level 1 | Long-term investments	'	'
Investment Securities	0	0
Fair Value, Inputs, Level 2	'	'
Investment Securities	312,921	333,784
Fair Value, Inputs, Level 2 | Cash equivalents	'	'
Cash Equivalents	23,506	70,615
Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	253,378	239,139
Fair Value, Inputs, Level 2 | Long-term investments	'	'
Investment Securities	36,037	24,030
Fair Value, Inputs, Level 3	'	'
Cash Equivalents	0	0
Investment Securities	0	0
Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	0	0
Fair Value, Inputs, Level 3 | Long-term investments	'	'
Investment Securities	0	0
Money market funds | Estimate of Fair Value | Cash equivalents	'	'
Cash Equivalents	20,172	3,689
Money market funds | Fair Value, Inputs, Level 1 | Cash equivalents	'	'
Cash Equivalents	20,172	3,689
Money market funds | Fair Value, Inputs, Level 2	'	'
Cash Equivalents	0	0
Money market funds | Fair Value, Inputs, Level 3	'	'
Cash Equivalents	0	0
Commercial paper | Estimate of Fair Value | Cash equivalents	'	'
Cash Equivalents	'	370
Commercial paper | Estimate of Fair Value | Short-term investments	'	'
Investment Securities	75,911	81,767
Commercial paper | Fair Value, Inputs, Level 1	'	'
Cash Equivalents	'	0
Commercial paper | Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	0	0
Commercial paper | Fair Value, Inputs, Level 2 | Cash equivalents	'	'
Cash Equivalents	'	370
Commercial paper | Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	75,911	81,767
Commercial paper | Fair Value, Inputs, Level 3	'	'
Cash Equivalents	'	0
Commercial paper | Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	0	0
Municipal debt securities | Estimate of Fair Value | Cash equivalents	'	'
Cash Equivalents	23,506	70,245
Municipal debt securities | Estimate of Fair Value | Short-term investments	'	'
Investment Securities	122,325	106,207
Municipal debt securities | Estimate of Fair Value | Long-term investments	'	'
Investment Securities	36,037	14,022
Municipal debt securities | Fair Value, Inputs, Level 1	'	'
Cash Equivalents	0	0
Municipal debt securities | Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	0	0
Municipal debt securities | Fair Value, Inputs, Level 1 | Long-term investments	'	'
Investment Securities	0	0
Municipal debt securities | Fair Value, Inputs, Level 2 | Cash equivalents	'	'
Cash Equivalents	23,506	70,245
Municipal debt securities | Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	122,325	106,207
Municipal debt securities | Fair Value, Inputs, Level 2 | Long-term investments	'	'
Investment Securities	36,037	14,022
Municipal debt securities | Fair Value, Inputs, Level 3	'	'
Cash Equivalents	0	0
Municipal debt securities | Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	0	0
Municipal debt securities | Fair Value, Inputs, Level 3 | Long-term investments	'	'
Investment Securities	0	0
Corporate debt securities | Estimate of Fair Value | Short-term investments	'	'
Investment Securities	45,134	33,297
Corporate debt securities | Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	0	0
Corporate debt securities | Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	45,134	33,297
Corporate debt securities | Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	0	0
Government debt securities | Estimate of Fair Value | Short-term investments	'	'
Investment Securities	10,008	12,005
Government debt securities | Estimate of Fair Value | Long-term investments	'	'
Investment Securities	'	10,008
Government debt securities | Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	0	0
Government debt securities | Fair Value, Inputs, Level 1 | Long-term investments	'	'
Investment Securities	'	0
Government debt securities | Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	10,008	12,005
Government debt securities | Fair Value, Inputs, Level 2 | Long-term investments	'	'
Investment Securities	'	10,008
Government debt securities | Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	0	0
Government debt securities | Fair Value, Inputs, Level 3 | Long-term investments	'	'
Investment Securities	'	0
Certificates of deposit | Estimate of Fair Value | Short-term investments	'	'
Investment Securities	'	5,863
Certificates of deposit | Fair Value, Inputs, Level 1 | Short-term investments	'	'
Investment Securities	'	0
Certificates of deposit | Fair Value, Inputs, Level 2 | Short-term investments	'	'
Investment Securities	'	5,863
Certificates of deposit | Fair Value, Inputs, Level 3 | Short-term investments	'	'
Investment Securities	'	$0

Income_Taxes_Income_Taxes_Deta

Income Taxes Income Taxes (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'
Operating Income (Loss)	'	$1,936	'	'
Deferred income taxes	'	4,206	796	'
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	'	51,362	43,627	27,830
Current Federal Tax Expense (Benefit)	'	52,732	36,409	16,920
Liability for Uncertain Tax Positions, Current	'	0	0	3,619
Income taxes paid, net of refunds	37,937	53,220	37,937	23,507
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	'	1,689	2,797	274
Current State and Local Tax Expense (Benefit)	'	4,114	3,462	2,890
Current Income Tax Expense (Benefit)	'	56,846	39,871	19,810
Deferred Federal Income Tax Expense (Benefit)	'	-1,811	6,082	9,982
Deferred State and Local Income Tax Expense (Benefit)	'	-134	280	324
DeferredTotalIncomeTaxExpenseBenefit	'	-1,945	6,362	10,306
PROVISION FOR INCOME TAXES	'	54,901	46,233	30,116
Income Tax Reconciliation, State and Local Income Taxes	'	2,654	2,301	1,328
Income Tax Reconciliation, Other Reconciling Items	'	885	305	958
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	'	0	0	0
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	'	0	0	0
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	'	0	0	-1,754
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	'	0	0	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	'	0	0	-1,865
Unrecognized Tax Benefits	'	$0	$0	$0

Income_Taxes_The_Major_Compone

Income Taxes The Major Components of the Company's Net Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	$48,160	$46,695
Deferred Tax Assets, Net of Valuation Allowance, Current	4,206	796
Accrued Vacation [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	895	935
Deferred Tax Liabilities, Net, Current	0	0
Accrued Bonus [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	4,484	'
Deferred Tax Liabilities, Net, Current	0	'
Prepaid Expenses [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	0	0
Deferred Tax Liabilities, Net, Current	-5,420	-3,769
State Taxes [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	1,269	1,120
Deferred Tax Liabilities, Net, Current	0	0
Accrued Property Taxes [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	919	815
Deferred Tax Liabilities, Net, Current	0	0
Other 1 [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	2,059	1,695
Deferred Tax Liabilities, Net, Current	0	0
Total Current [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	9,626	4,565
Deferred Tax Liabilities, Net, Current	-5,420	-3,769
Valuation Allowance of Deferred Tax Assets [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	0	'
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	-663	'
Total Noncurrent [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	-53,161	-49,687
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	5,001	2,992
Depreciation [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	-51,750	-49,687
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0	0
Goodwill [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	0	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	603	717
Stock Based Compensation [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	0	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	3,711	2,118
Other 1 [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	-1,411	0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	672	157
Valuation Allowance, Operating Loss Carryforwards [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	0	'
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	678	'
Total [Member]	'	'
Valuation Allowance	'	'
Deferred Tax Liabilities, Net, Noncurrent	-58,581	-53,456
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	$14,627	$7,557

Income_Taxes_The_Components_of

Income Taxes The Components of the Provision (Benefit) for Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
The Components of the Provision (Benefit) for Income Taxes [Abstract]	'	'	'
Current Federal Tax Expense (Benefit)	$52,732	$36,409	$16,920
Current State and Local Tax Expense (Benefit)	4,114	3,462	2,890
Current Income Tax Expense (Benefit)	56,846	39,871	19,810
Deferred Federal Income Tax Expense (Benefit)	-1,811	6,082	9,982
Deferred State and Local Income Tax Expense (Benefit)	-134	280	324
DeferredTotalIncomeTaxExpenseBenefit	-1,945	6,362	10,306
PROVISION FOR INCOME TAXES	$54,901	$46,233	$30,116

Income_Taxes_Reconciliation_of

Income Taxes Reconciliation of the Statutory Income Tax Rate and the Company's Effective Tax Rate (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the Statutory Income Tax Rate and the Company's Effective Tax Rate [Abstract]	'	'	'
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$51,362	$43,627	$27,830
Income Tax Reconciliation, State and Local Income Taxes	2,654	2,301	1,328
Income Tax Reconciliation, Other Reconciling Items	885	305	958
PROVISION FOR INCOME TAXES	$54,901	$46,233	$30,116

Income_Taxes_Reconciliation_of1

Income Taxes Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefit (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefit [Abstract]	'	'	'
Liability for Uncertain Tax Positions, Current	$0	$0	$3,619
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0	0	1,754
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	0	0	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	0	0	1,865
Unrecognized Tax Benefits	$0	$0	$0

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013
				Chief Executive Officer [Member]	Chief Executive Officer [Member]
Related Party Transaction [Line Items]	'	'	'	'	'
Related Party Transaction, Amounts of Transaction	$4,811	$2,303	$2,284	$187	$938

Financial_Instruments_and_Risk1

Financial Instruments and Risk Management (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Debt, Long-term and Short-term, Combined Amount	$234,300	$150,852

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2006
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	108,041	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	145,232,000	128,029,000	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$62.61	$52.63	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingNumber	283,631	228,690	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingWeightedAverageExercisePrice	49.48	36.89	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	$1,449	'	'	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$81.77	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	0	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate	30.49%	33.62%	58.32%	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	6,132	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsGrantsInPeriodWeightedAverageGrantDateFairValue	$20.92	'	$19.01	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$84.36	$55.09	$43.32	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsExercisesInPeriodTotalIntrinsicValue	3,261	9,123	1,407	'
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	5.00%	'	'	'
Defined Contribution Plan, Cost Recognized	2,879	2,537	2,002	'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	'	'	'	3,000,000
Stock-based compensation expense	9,818	4,069	4,735	'
Proceeds from exercise of stock options and stock-settled SARs	2,083	7,542	1,834	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	7,187	2,537	2,131	'
FairValueSARsLiability	1,656	'	'	'
Cash-settled SARs	2,234	'	'	'
EmployeeServiceShareBasedCompensationNonvestedAwardTotalCompensationCostNotYetRecognized	9,815	'	'	'
EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostsNotYetRecognizedPeriodForRecognition	'1 year 10 months 24 days	'	'	'
Fair Value Assumptions, Expected Term	'	'1 year 6 months	'2 years 7 months 6 days	'
Fair Value Assumptions, Risk Free Interest Rate	0.28%	0.45%	0.80%	'
Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%	'
Exercised (in Shares)	-53,100	'	'	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	'	$38.03	'	'
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsSARsOutstandingWeightedAverageRemainingContractualTerm2	'3 years 4 months 17 days	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingIntrinsicValue	$14,507	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	85,196,000	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	-64,426,000	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$52.57	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	-3,567,000	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$82.87	'	'	'
Restricted Stock [Member]	'	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	'1 year 10 months 21 days	'	'	'
Stock Appreciation Rights (SARs) [Member]	'	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	'1 year 9 months 4 days	'	'	'
Stock Options [Member]	'	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	'2 years 2 months 1 day	'	'	'
3/25/11 Grant [Member] | Stock Appreciation Rights (SARs) [Member]	'	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Outstanding at January 1, 2012	'	97,109	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsOutstandingWeightedAverageExercisePrice.	'	$19.01	'	'
Fair Value Assumptions, Expected Term	'3 months 18 days	'	'	'
StockIssuedDuringPeriodSharesSARsExercise	-29,098	'	'	'
Exercises (in Dollars per share)	$19.01	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsForfeituresInPeriod	-307	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsForfeituresInPeriodWeightedAverageExercisePrice	$19.01	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentSARsOutstandingNumberEndOfPeriod	67,704	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsOutstandingWeightedAverageExercisePriceEndOfYear	$19.01	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsExercisableNumber	7,363	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsExercisableWeightedAverageExercisePrice	$19.01	'	'	'
3/8/13 Grant [Member] | Stock Appreciation Rights (SARs) [Member]	'	'	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'	'	'
Fair Value Assumptions, Expected Term	'2 years 6 months	'0 days	'0 days	'
Fair Value Assumptions, Risk Free Interest Rate	0.54%	0.00%	0.00%	'
StockIssuedDuringPeriodSharesSARsExercise	70,812	'	'	'
Exercises (in Dollars per share)	$20.92	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentSARsOutstandingNumberEndOfPeriod	70,812	'	'	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardSARsOutstandingWeightedAverageExercisePriceEndOfYear	$20.92	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Aug. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
	aircraft	aircraft	aircraft	aircraft
Long-term Purchase Commitment [Line Items]	'	'	'	'
Purchase Commitment, Remaining Minimum Amount Committed	23,360	'	'	'
Airbus A320 [Member] | Capital Addition Purchase Commitments [Member]	'	'	'	'
Long-term Purchase Commitment [Line Items]	'	'	'	'
Number Of Aircraft Committed To Purchase	5	2	2	7
Number Of Aircraft Committed To Purchase, Total	9	'	'	'

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data (Unaudited) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$238,471	$228,874	$255,846	$272,959	$222,838	$216,864	$231,166	$237,851	$996,150	$908,719	$779,117
Operating Income (Loss)	30,281	29,232	42,856	52,367	25,377	28,748	41,868	36,311	154,737	132,304	85,444
Net Income (Loss) Attributable to Parent	$17,476	$17,106	$25,760	$31,932	$14,766	$16,945	$25,183	$21,703	$92,273	$78,597	$49,398
Basic (in Dollars per share)	$0.96	$0.91	$1.35	$1.66	$0.78	$0.88	$1.31	$1.13	$4.85	$4.10	$2.59
Earnings Per Share, Diluted	$0.94	$0.91	$1.34	$1.65	$0.76	$0.87	$1.30	$1.12	$4.82	$4.06	$2.57