XML 85 R69.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Subsequent Event (Details) - Note payable at a fixed interest rate of 2.25%, maturing in January 2018, secured by engines - engine |  | 12 Months Ended
--- | --- | ---
Jan. 10, 2014 | Dec. 31, 2015
Subsequent events |  |
Number of engines pledged as collateral | 3 |
LIBOR |  |
Subsequent events |  |
Basis spread on variable rate (as a percent) |  | 2.25%

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of engines provided as collateral for debt. + References No definition available. + Details
Name: | wlfc_DebtInstrumentNumberOfEnginesAsCollateral
Namespace Prefix: | wlfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=wlfc_SecuredDebt2.25PercentFourYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |