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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Rent payments under operating leases $ 1,800,000us-gaap_LeaseAndRentalExpense $ 1,700,000us-gaap_LeaseAndRentalExpense $ 1,600,000us-gaap_LeaseAndRentalExpense
Unrecognized tax benefits ,penalties and interest expense 58,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 428,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Liability associated with potential pre-acquisition sales 250,000edgw_PotentialPreAcquisitionSalesAndUseTaxObligations    
Sales and use tax exposure estimated $ 1,500,000edgw_BusinessCombinationEstimatedSalesAndUseTaxExposureReducedAmount