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Employee Stock Purchase Plan Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
EMC Information Infrastructure
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Cash proceeds $ 141,023,000 $ 120,694,000 $ 115,312,000
Common shares purchased 6,899,000 6,949,000 10,324,000
Weighted-average price per share $ 20.44 $ 17.37 $ 11.17
VMware
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Cash proceeds $ 56,964,000 $ 45,162,000 $ 18,267,000
Common shares purchased 816,000 1,510,000 907,000
Weighted-average price per share $ 69.81 $ 29.90 $ 20.14