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Composition of Teradata Restricted Stock Grants (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 1,101    
Weighted-Average Grant Date Fair Value $ 60.71 $ 45.19 $ 34.32
Service-Based Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 614    
Weighted-Average Grant Date Fair Value $ 62.41    
Performance-Based Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 487    
Weighted-Average Grant Date Fair Value $ 58.56