v2.4.1.9
Encore Wire Corporation 401(k) Profit Sharing Plan - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Defined Contribution Plan, Age Requirement 21wire_DefinedContributionPlanAgeRequirement      
Defined Contribution Plan, Required Service Period 1 year      
Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent 1.00%wire_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent      
Defined Contribution Plan, Employer Matching Contribution, Percent Of Match, Level One 100.00%wire_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchLevelOne      
Defined Contribution Plan, Employer Matching Contribution, Percent, Level One 3.00%wire_DefinedContributionPlanEmployerMatchingContributionPercentLevelOne      
Defined Contribution Plan, Employer Matching Contribution, Percent Of Match, Level Two 50.00%wire_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchLevelTwo      
Defined Contribution Plan, Employer Matching Contribution, Percent, Level Two 2.00%wire_DefinedContributionPlanEmployerMatchingContributionPercentLevelTwo      
Defined Contribution Plan, Employers Matching Contribution, Vested Percentage 100.00%wire_DefinedContributionPlanEmployersMatchingContributionVestedPercentage      
Defined Contribution Plan, Cost Recognized $ 900,000us-gaap_DefinedContributionPlanCostRecognized $ 900,000us-gaap_DefinedContributionPlanCostRecognized $ 700,000us-gaap_DefinedContributionPlanCostRecognized  
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount  
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage      
Subsequent Event        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Defined Contribution Plan, Age Requirement       18wire_DefinedContributionPlanAgeRequirement
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Defined Contribution Plan, Notification Period for Change in 401(k) Plan       30 days
Defined Contribution Plan, Percentage of Compensation Automatically Contributed       5.00%wire_DefinedContributionPlanPercentageofCompensationAutomaticallyContributed
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember