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Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Dec. 31, 2012 | Sep. 28, 2012 | Jun. 29, 2012 | Mar. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Numerators: |  |  |  |  |  |  |  |  |  |  |
Consolidated income from continuing operations | $ 4,367 | $ 2,172 | $ 842 | $ 1,469 | $ 14,875 | $ 2,055 | $ 4,467 | $ 1,077 | $ 8,850 | $ 22,474 | $ 21,676
Less: Income attributable to noncontrolling interest | 20 | 12 | (18) | (36) | 5 | (19) | (8) | (18) | (22) | (40) | (28)
Income from continuing operations attributable to GSI Group Inc. |  |  |  |  |  |  |  |  | 8,828 | 22,434 | 21,648
Income (loss) from discontinued operations. |  |  |  |  |  |  |  |  | (1,519) | (2,896) | 7,325
Net income attributable to GSI Group Inc. | $ 4,308 | $ 1,790 | $ (871) | $ 2,082 | $ 15,818 | $ (2,534) | $ 4,873 | $ 1,381 | $ 7,309 | $ 19,538 | $ 28,973
Denominators: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding-basic |  |  |  |  |  |  |  |  | 34,073 | 33,775 | 33,481
Dilutive potential common shares |  |  |  |  |  |  |  |  | 323 | 161 | 108
Weighted average common shares outstanding-diluted |  |  |  |  |  |  |  |  | 34,396 | 33,936 | 33,589
Antidilutive common shares excluded from above |  |  |  |  |  |  |  |  | 246 | 244 | 132
Basic Earnings (Loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations | $ 0.13 | $ 0.06 | $ 0.02 | $ 0.04 | $ 0.44 | $ 0.06 | $ 0.13 | $ 0.03 | $ 0.26 | $ 0.66 | $ 0.65
From discontinued operations |  | $ (0.01) | $ (0.05) | $ 0.02 | $ 0.03 | $ (0.13) | $ 0.01 | $ 0.01 | $ (0.05) | $ (0.08) | $ 0.22
Basic earnings per share attributable to GSI Group Inc. | $ 0.13 | $ 0.05 | $ (0.03) | $ 0.06 | $ 0.47 | $ (0.07) | $ 0.14 | $ 0.04 | $ 0.21 | $ 0.58 | $ 0.87
Diluted Earnings (Loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations | $ 0.13 | $ 0.06 | $ 0.02 | $ 0.04 | $ 0.44 | $ 0.06 | $ 0.13 | $ 0.03 | $ 0.26 | $ 0.66 | $ 0.64
From discontinued operations |  | $ (0.01) | $ (0.05) | $ 0.02 | $ 0.03 | $ (0.13) | $ 0.01 | $ 0.01 | $ (0.05) | $ (0.08) | $ 0.22
Diluted earnings per share attributable to GSI Group Inc. | $ 0.13 | $ 0.05 | $ (0.03) | $ 0.06 | $ 0.47 | $ (0.07) | $ 0.14 | $ 0.04 | $ 0.21 | $ 0.58 | $ 0.86

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