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v3.10.0.1

Summary of Significant Accounting Policies (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 USD ($)
Impact from adoption of ASU 2018-02 | $ 59 | [1]
Reclassification |  |
Increase to Cost of spare parts and equipment sales | 1,800 |
Decrease to Write-down of equipment | $ (1,800) |
[1] | Reflects the stranded tax effects from change in tax rate as a result of the early adoption of ASU 2018-02 which has been reclassified to retained earnings.

X
- Definition The amount of decrease to Write-down of equipment. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase to Cost of spare parts and equipment sales. + References No definition available. + Details
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Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount that reflects the stranded tax effects from change in tax rate as a result of the early adoption of ASU 2018-02 which has been reclassified to retained earnings. + References No definition available. + Details
Name: | wlfc_ReclassificationOfStandardTaxEffectsFromAccumulatedOtherComprehensiveIncomeToRetainedEarnings
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_RestatementAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |