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CONTINGENCIES (Details) (COSA, Subsidiaries, USD $)
 0 Months Ended
Jul. 16, 2014
COSA | Subsidiaries
  
Loss Contingencies [Line Items]  
Minimum revenue shortfall alleged in lawsuit $ 9,000,000wldn_LossContingencyRevenueShortfallMinimum
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wldn_CostOfServiceAnalysisMember
Alleged cost to retain another consultant 130,000wldn_LossContingencyCostOfAnotherConsultant
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wldn_CostOfServiceAnalysisMember
Alleged costs associated with noticing and conducting public hearings $ 83,052wldn_LossContingencyPublicHearingCosts
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wldn_CostOfServiceAnalysisMember