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171 - Disclosure - Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)
(http://www.adtran.com/taxonomy/role/DisclosureIncomeTaxesEffectiveIncomeTaxRateDiffersFromFederalStatutoryRate)
TableSchedule Of Effective Income Tax Rate Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000926282 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]Period [Axis]
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
2010-01-01 - 2010-12-31
Tax provision computed at the federal statutory rate
0.35  
0.35  
0.35  
State income tax provision, net of federal benefit
.0378  
.0319  
.0333  
Federal research credits
 
(.0250) 
(.0290) 
Valuation allowance on losses of foreign subsidiaries
.0380  
 
 
Tax-exempt income
(.0101) 
(.0027) 
(.0046) 
State tax incentives
(.0446) 
(.0090) 
(.0086) 
Stock-based compensation
.0236  
.0003  
.0034  
Domestic production activity deduction
(.0321) 
(.0184) 
(.0237) 
Other, net
(.0103) 
.0007  
.0015  
Effective Tax Rate
.3523  
 
.3278  
 
.3223