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Segment Information - Sales and Gross Profit of Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Sales $ 142,835us-gaap_SalesRevenueNet $ 147,004us-gaap_SalesRevenueNet
Gross Profit 65,563us-gaap_GrossProfit 77,790us-gaap_GrossProfit
Carrier Networks [Member]    
Segment Reporting Information [Line Items]    
Sales 116,014us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_CarrierNetworksMember		 118,162us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_CarrierNetworksMember
Gross Profit 49,859us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_CarrierNetworksMember		 61,353us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_CarrierNetworksMember
Enterprise Networks [Member]    
Segment Reporting Information [Line Items]    
Sales 26,821us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_EnterpriseNetworksMember		 28,842us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_EnterpriseNetworksMember
Gross Profit $ 15,704us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_EnterpriseNetworksMember		 $ 16,437us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= adtn_EnterpriseNetworksMember