Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 29, 2013	Mar. 30, 2012
Amounts attributable to GSI Group Inc:
Income from continuing operations	$ 1,433	$ 1,059
Income from discontinued operations.	649	322
Net income attributable to GSI Group Inc.	$ 2,082	$ 1,381
Denominators:
Weighted average common shares outstanding - basic	33,983	33,679
Dilutive potential common shares	288	199
Weighted average common shares outstanding - diluted	34,271	33,878
Antidilutive common shares excluded from above	373
Basic Earnings per Common Share:
From continuing operations	$ 0.04	$ 0.03
From discontinued operations	$ 0.02	$ 0.01
Basic earnings per share attributable to GSI Group Inc.	$ 0.06	$ 0.04
Diluted Earnings per Common Share:
From continuing operations	$ 0.04	$ 0.03
From discontinued operations	$ 0.02	$ 0.01
Diluted earnings per share attributable to GSI Group Inc.	$ 0.06	$ 0.04

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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