XML 63 R40.htm IDEA: XBRL DOCUMENT
v3.19.3

Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) engine aircraft. | Sep. 30, 2018 USD ($) engine aircraft. | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value of equipment held for operating lease | $ 1,624,937 |  | $ 1,624,937 |  | $ 1,673,135
Management fees included in other revenue | $ 3,105 | $ 2,010 | $ 10,674 | $ 5,762 |
WMES |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest | 50.00% |  | 50.00% |  |
Number of engines in lease portfolio | engine |  |  | 32 |  |
Number of aircraft in lease portfolio | aircraft. |  |  | 6 |  |
Net book value of equipment held for operating lease | $ 299,300 |  | $ 299,300 |  |
Number of aircrafts sold | aircraft. |  |  | 5 |  |
Proceeds from sale of aircraft |  |  | $ 76,400 |  |
Number of engines sold | engine |  |  |  | 2 |
Proceeds from sale of engines |  |  |  | $ 23,200 |
WMES | Asset Management |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Management fees included in other revenue | $ 700 | $ 600 | $ 1,800 |  |
Willis Aeronautical Services, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of engines sold | engine |  |  | 1 | 1 |
Proceeds from sale of engines |  |  | $ 2,600 | $ 2,600 |
CASC Willis |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest | 50.00% |  | 50.00% |  |
Number of engines in lease portfolio | engine |  |  | 4 |  |
Net book value of equipment held for operating lease | $ 48,700 |  | $ 48,700 |  |
Number of aircrafts sold | aircraft. |  |  | 0 | 0 |
Number of engines sold | engine |  |  | 0 | 0 |

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of aircraft operated by the carrier. + References No definition available. + Details
Name: | us-gaap_NumberOfAircraftOperated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue and income classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
Name: | us-gaap_OtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of engines in lease portfolio of equity method investee. + References No definition available. + Details
Name: | wlfc_EquityMethodInvestmentNumberOfEnginesInLeasePortfolio
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Aircrafts Sold + References No definition available. + Details
Name: | wlfc_NumberOfAircraftsSold
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of engines sold by the entity. + References No definition available. + Details
Name: | wlfc_NumberOfEnginesSold
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of cash inflow from sale of engines. + References No definition available. + Details
Name: | wlfc_RelatedPartyTransactionProceedsFromSaleOfEngines
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Related Party Transaction Proceeds from Sale of Aircraft + References No definition available. + Details
Name: | wlfc_RelatedPartyTransactionProceedsfromSaleofAircraft
Namespace Prefix: | wlfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wlfc_WillisMitsuiAndCompanyEngineSupportLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wlfc_AssetManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wlfc_WillisAeronauticalServicesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wlfc_CSCWillisEngineLeaseCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |