XML 39 R27.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Impact from adoption of ASU 2018-02 | [1] | $ 59 |
Reclassification |  |  |
Increase to Cost of spare parts and equipment sales |  | 900 | $ 900
Decrease to Write-down of equipment |  | $ (900) |
[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
Name: | wlfc_DecreaseToWriteDownOfEquipment
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
Name: | wlfc_IncreaseToCostOfSparePartsAndEquipmentSales
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: |