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Summary of Restricted Stock Unit Awards Activity (Detail) (Restricted Stock Units (RSUs), USD $)
6 Months Ended
Jun. 30, 2012
Restricted Stock Units (RSUs)
 
Number of Shares  
Nonvested at January 1, 2012 236,331
Granted   
Vested (128,948)
Forfeited (16,268)
Nonvested at June 30, 2012 91,115 [1],[2]
Weighted-Average Grant Date Fair Value  
Nonvested at January 1, 2012 $ 15.88
Granted   
Vested $ 15.36
Forfeited $ 15.76
Nonvested at June 30, 2012 $ 16.64 [1],[2]
[1] 81,224 of these shares are expected to vest.
[2] Contractual vesting may be altered by the ultimate terms and conditions associated with the completion of the pending merger transaction with Dell (See Note 1).