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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable percentage not attained by individual customer         10.00%avid_AccountsReceivablePercentageNotAttainedByIndividualCustomer   10.00%avid_AccountsReceivablePercentageNotAttainedByIndividualCustomer  
Revenue, Net $ 128,196us-gaap_SalesRevenueNet $ 142,429us-gaap_SalesRevenueNet $ 124,644us-gaap_SalesRevenueNet $ 134,982us-gaap_SalesRevenueNet $ 147,103us-gaap_SalesRevenueNet $ 530,251us-gaap_SalesRevenueNet $ 563,412us-gaap_SalesRevenueNet $ 635,703us-gaap_SalesRevenueNet
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent           $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity  
Implied Maintenance Release PCS Service Period           1 to 8 years    
Other Intangible Assets [Member] | Maximum Estimated Useful Life of Intangible Assets [Member]                
Finite-Lived Intangible Asset, Useful Life           12 years    
Other Intangible Assets [Member] | Minimum Estimated Useful Life of Intangible Assets [Member]                
Finite-Lived Intangible Asset, Useful Life           2 years    
Software Development [Member]                
Capitalized software costs, expected life, minimum           12    
Capitalized software costs, expected useful life, maximum           36    
Minimum [Member]                
Extended Product Warranty Description           90 days to one year    
Maximum [Member]                
Extended Product Warranty Description           five