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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 995    
Weighted-Average Grant Date Fair Value $ 48.24 $ 60.71 $ 45.19
Service-Based Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 911    
Weighted-Average Grant Date Fair Value $ 46.90    
Performance-Based Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares 84    
Weighted-Average Grant Date Fair Value $ 62.77