XML 48 R49.htm IDEA: XBRL DOCUMENT v3.20.1

Related Party Transactions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 engine	Mar. 31, 2020 aircraft.	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($) engine aircraft.
Related Party Transaction [Line Items]
Maintenance reserve revenue			$ 20,528	$ 25,350
Number of engines sold | engine	0			0
WMES
Related Party Transaction [Line Items]
Number of aircrafts sold | aircraft.		0		5
Proceeds from sale of aircraft				$ 75,500
Number of engines sold	0	0
WMES | Other Income | Asset Management
Related Party Transaction [Line Items]
Maintenance reserve revenue			$ 500	$ 600
CASC Willis
Related Party Transaction [Line Items]
Number of aircrafts sold | aircraft.		0		0
Number of engines sold | engine	0			0

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

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
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_CSCWillisEngineLeaseCompanyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: