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Summary of Nonvested Transaction Restricted Share Awards Issued under Stock Incentive Plan and Changes During Period (Detail) (Stock Incentive Plan 2003, USD $)
6 Months Ended
Jun. 30, 2012
Stock Incentive Plan 2003
 
Number of Restricted Share Awards  
Beginning Balance   
Transaction RSAs converted upon acquisition of S1 170,205
Vested (75,478)
Forfeited (15,540)
Ending Balance 79,187
Weighted-Average Grant Date Fair Value  
Beginning Balance   
Transaction RSAs converted upon acquisition of S1 $ 35.41
Vested $ 35.41
Forfeited $ 35.41
Ending Balance $ 35.41