CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 28, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 31,741	$ 60,980
Accounts receivable, net of allowance of $682 and $575, respectively	61,314	48,552
Inventories	63,834	58,290
Income taxes receivable	5,455	5,715
Deferred tax assets	8,786	6,351
Prepaid expenses and other current assets	4,872	5,134
Assets of discontinued operations	16,135	16,088
Total current assets	192,137	201,110
Property, plant and equipment, net	31,448	31,303
Deferred tax assets	497	519
Other assets	11,957	9,426
Intangible assets, net	102,763	65,293
Goodwill	115,182	71,156
Total assets	453,984	378,807
Current Liabilities
Current portion of long-term debt	7,500	7,500
Accounts payable	26,572	24,361
Income taxes payable	535	1,018
Deferred tax liabilities	214	214
Accrued expenses and other current liabilities	21,875	22,288
Liabilities of discontinued operations	7,336	6,398
Total current liabilities	64,032	61,779
Long-term debt	129,125	64,000
Deferred tax liabilities	4,389
Income taxes payable	8,018	5,596
Other liabilities	4,750	5,029
Total liabilities	210,314	136,404
Commitments and Contingencies (Note 13)
Stockholders' Equity:
Common shares, no par value; Authorized shares: unlimited; Issued and outstanding: 34,173 and 33,991, respectively	423,856	423,856
Additional paid-in capital	25,659	25,383
Accumulated deficit	(199,930)	(200,913)
Accumulated other comprehensive loss	(6,341)	(6,342)
Total GSI Group Inc. stockholders' equity	243,244	241,984
Noncontrolling interest	426	419
Total stockholders' equity	243,670	242,403
Total liabilities and stockholders' equity	$ 453,984	$ 378,807