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Commitments, Contingencies, Guarantees and Indemnities (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($)
Engines Aircraft and Related Equipment [Member] |
Purchase commitments |
Purchase price | $ 31.6

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=wlfc_EnginesAircraftAndRelatedEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |