| Component: (Network and Table) | |
|---|---|
| Network | 175 - Disclosure - Income Taxes - Change in Unrecognized Income Tax Benefits (Detail) (http://www.adtran.com/taxonomy/role/DisclosureIncomeTaxesChangeInUnrecognizedIncomeTaxBenefits) |
| Table | Components Of Income Before Taxes [Table] |
| Reporting Entity [Axis] | 0000926282 (http://www.sec.gov/CIK) |
| Legal Entity [Axis] | Entity [Domain] |
| 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 |