v2.4.1.9

Income Taxes - Summary of Net Deferred Tax Liability (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), current | $ 1,306 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | $ 4,756 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Deferred income tax asset (liability), non-current | (20,226)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | (21,327)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Depreciation |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), non-current | (20,226)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_DepreciationMember | (21,327)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_DepreciationMember
Inventory |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), current | (451)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_InventoryMember | 3,104 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_InventoryMember
Allowance for doubtful accounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), current | 749 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 749 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember
Uniform capitalization rules |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), current | 463 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_UniformCapitalizationRulesMember | 309 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_UniformCapitalizationRulesMember
Other |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred income tax asset (liability), current | $ 545 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_AllOtherAssetsMember | $ 594 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / us-gaap_ValuationAllowancesAndReservesTypeAxis = wire_AllOtherAssetsMember

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