| Component: (Network and Table) | |
|---|---|
| Network | 152 - Disclosure - Stock Incentive Plans - Summary of RSUs and Restricted Stock Outstanding (Detail) (http://www.adtran.com/taxonomy/role/DisclosureStockIncentivePlansSummaryOfRSUsAndRestrictedStockOutstanding) |
| Table | Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] |
| Reporting Entity [Axis] | 0000926282 (http://www.sec.gov/CIK) |
| Legal Entity [Axis] | Entity [Domain] |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Period [Axis] |
|---|---|
2012-01-01 - 2012-12-31 | |
Number of Unvested RSUs and restricted stock outstanding, beginning balance | 90,000 |
Number of RSUs and restricted stock granted | 51,000 |
Number of RSUs and restricted stock vested | (21,000) |
Number of RSUs and restricted stock cancelled/forfeited | xsi:nil |
Number of Unvested RSUs and restricted stock outstanding, Adjustments to shares granted due to shares earned at vesting | (17,000) |
Number of Unvested RSUs and restricted stock outstanding, ending balance | 103,000 |
Weighted Average Grant Date Fair Value, Unvested RSUs and restricted stock outstanding, Beginning balance | 34.21 |
Weighted Average Grant Date Fair Value, RSUs and restricted stock granted | 19.50 |
Weighted Average Grant Date Fair Value, RSUs and restricted stock vested | 27.75 |
Weighted Average Grant Date Fair Value, RSUs and restricted stock cancelled/forfeited | xsi:nil |
Weighted Average Grant Date Fair Value, Adjustments to shares granted due to shares earned at vesting | 26.65 |
Weighted Average Grant Date Fair Value, Unvested RSUs and restricted stock outstanding, Ending balance | 29.25 |