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100790 - Disclosure - Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)
(http://www.adtran.com/20161231/taxonomy/role/DisclosureIncomeTaxesEffectiveIncomeTaxRateDiffersFromFederalStatutoryRateDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000926282 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Tax provision computed at the federal statutory rate
35.00%  
35.00%  
35.00%  
State income tax provision, net of federal benefit
3.93%  
4.86%  
2.69%  
Federal research credits
(8.15%) 
(12.55%) 
(4.05%) 
Foreign taxes
(0.34%) 
2.10%  
(7.26%) 
Tax-exempt income
(0.53%) 
(1.94%) 
(1.25%) 
State tax incentives
(2.77%) 
(5.04%) 
(2.21%) 
Stock-based compensation
2.53%  
6.91%  
3.06%  
Domestic production activity deduction
(2.23%) 
(3.17%) 
(1.15%) 
Bargain purchase
(2.64%) 
  
Other, net
0.08%  
1.30%  
0.69%  
Effective Tax Rate
24.88%  
 
27.47%  
 
25.52%