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Commitments, Contingencies, Guarantees and Indemnities (Details 2) (Engines Aircraft and Related Equipment [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Engines Aircraft and Related Equipment [Member]
 
Purchase commitments  
Purchase price $ 23.1us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= wlfc_EnginesAircraftAndRelatedEquipmentMember
Non-refundable deposits paid $ 6.8wlfc_LongTermPurchaseCommitmentNonrefundableDeposits
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= wlfc_EnginesAircraftAndRelatedEquipmentMember