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v3.3.1.900

Acquisition (Details) - Asset Purchase Agreement - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 06, 2013 | Dec. 31, 2013
Purchase price allocated to major classes of assets |  |
Spare parts inventory | $ 3.4 |
Accounts receivables | 1.7 |
Identifiable intangible assets | 1.2 |
Goodwill | 0.3 |
J.T. Power |  |
Acquisitions [Line Items] |  |
Value of certain assets purchased | 5.6 | $ 5.6
Cash payment for certain asset purchases | 4.5 | 4.5
Cash received | 0.4 | $ 0.4
J.T. Power | Consignment agreement with guarantee |  |
Acquisitions [Line Items] |  |
Amount owed to the entity related to the minimum guarantee, which is deducted from payment made in cash | $ 0.7 |

X
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Acquisitions [Line Items] + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amounts owed to the entity related to the minimum guarantee, which is deducted from payment made in cash under transactions with related party. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the cash payment made by the entity in the significant acquisition or disposal. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cash received by the entity in the significant acquisition or disposal. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the value of all consideration given or received by the entity in the significant acquisition or disposal, which has been allocated to accounts receivables. + References No definition available. + Details
Name: | wlfc_SignificantAcquisitionsAndDisposalsAcquisitionPurchasePriceAllocationToAccountsReceivables
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the value of all consideration given or received by the entity in the significant acquisition or disposal, which has been allocated to goodwill. + References No definition available. + Details
Name: | wlfc_SignificantAcquisitionsAndDisposalsAcquisitionPurchasePriceAllocationToGoodwill
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the value of all consideration given or received by the entity in the significant acquisition or disposal, which has been allocated to identifiable intangible assets. + References No definition available. + Details
Name: | wlfc_SignificantAcquisitionsAndDisposalsAcquisitionPurchasePriceAllocationToIdentifiableIntangibleAssets
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the value of all consideration given or received by the entity in the significant acquisition or disposal, which has been allocated to spare parts inventory. + References No definition available. + Details
Name: | wlfc_SignificantAcquisitionsAndDisposalsAcquisitionPurchasePriceAllocationToSparePartsInventory
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wlfc_AssetPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |