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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrecognized tax benefits      
Balance at the beginning of the period $ 566,000us-gaap_UnrecognizedTaxBenefits $ 406,000us-gaap_UnrecognizedTaxBenefits  
Increases related to current year tax positions 109,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 160,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Decreases due to tax positions released (211,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations    
Balance at the end of the period 464,000us-gaap_UnrecognizedTaxBenefits 566,000us-gaap_UnrecognizedTaxBenefits  
Uncertain tax positions, reserved resulting from the extraterritorial income exclusion   200,000wlfc_UncertainTaxPositionsReservedFromExtraterritorialIncomeExclusion  
Uncertain tax positions, reserved for tax exposure in Europe 0wlfc_UncertainTaxPositionsReservedForForeignExposure   100,000wlfc_UncertainTaxPositionsReservedForForeignExposure
Deferred tax assets:      
Unearned lease revenue 1,368,000wlfc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedLeaseRevenue 1,134,000wlfc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedLeaseRevenue  
State taxes 564,000us-gaap_DeferredTaxAssetsStateTaxes 532,000us-gaap_DeferredTaxAssetsStateTaxes  
Reserves and allowances 938,000wlfc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndAllowances 853,000wlfc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndAllowances  
Other accruals 582,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 1,048,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther  
Alternative minimum tax credit 377,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 377,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Net operating loss carry forward 37,173,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 36,778,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Charitable contributions 28,000us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 17,000us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards  
Total deferred tax assets 41,030,000us-gaap_DeferredTaxAssetsGross 40,739,000us-gaap_DeferredTaxAssetsGross  
Less: valuation allowance (1,310,000)us-gaap_DeferredTaxAssetsValuationAllowance    
Net deferred tax assets 39,720,000us-gaap_DeferredTaxAssetsNet 40,739,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Depreciation and impairment on aircraft engines and equipment (129,332,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (125,675,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Other deferred tax liabilities (898,000)us-gaap_DeferredTaxLiabilitiesOther (1,575,000)us-gaap_DeferredTaxLiabilitiesOther  
Net deferred tax liabilities (130,230,000)us-gaap_DeferredTaxLiabilities (127,250,000)us-gaap_DeferredTaxLiabilities  
Other comprehensive income, deferred tax asset   (174,000)wlfc_DeferredTaxAssetsOtherComprehensiveIncome  
Net deferred tax liabilities $ (90,510,000)us-gaap_DeferredIncomeTaxLiabilities $ (86,685,000)us-gaap_DeferredIncomeTaxLiabilities