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COMMITMENTS AND VARIABLE INTEREST ENTITIES - Variable Interest Entities (Details) | 9 Months Ended
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Sep. 30, 2022 item
COMMITMENTS AND VARIABLE INTEREST ENTITIES |
Number of VIEs | 1

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- References No definition available. + Details
Name: | wldn_CommitmentsDisclosureAbstract
Namespace Prefix: | wldn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the information pertaining to number of variable entities. + References No definition available. + Details
Name: | wldn_NumberOfVariableInterestEntity
Namespace Prefix: | wldn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration