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Network
175 - Disclosure - Income Taxes - Change in Unrecognized Income Tax Benefits (Detail)
(http://www.adtran.com/taxonomy/role/DisclosureIncomeTaxesChangeInUnrecognizedIncomeTaxBenefits)
TableComponents Of Income Before Taxes [Table]
Slicers (applies to each fact value in each table cell)
Components Of Income Before Taxes [Line Items]Period [Axis]
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
2010-01-01 - 2010-12-31
Balance at beginning of period
2,970,000  
2,593,000  
2,919,000  
Increases for tax position related to, Prior years
965,000  
 
197,000  
Increases for tax position related to, Current year
302,000  
840,000  
818,000  
Decreases for tax positions related to, Prior years
(49,000) 
(92,000) 
(16,000) 
Settlements with taxing authorities
(507,000) 
(354,000) 
(630,000) 
Expiration of applicable statute of limitations
(755,000) 
(17,000) 
(695,000) 
Balance at end of period
2,926,000  
 
2,970,000  
 
2,593,000