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Summary of Nonvested Trasaction RSAs Issued Under Stock Incentive Plan and Changes During Period (Detail) (Stock Incentive Plan 2003, USD $)
3 Months Ended
Mar. 31, 2012
Stock Incentive Plan 2003
 
Nonvested Restricted Share Awards  
Beginning Balance   
Transaction RSAs converted upon acquisition of S1 170,205
Vested (67,857)
Forfeited (747)
Ending Balance 101,601
Nonvested Transaction Restricted Share Awards  
Beginning Balance   
Transaction RSAs converted upon acquisition of S1 $ 35.41
Vested $ 35.41
Forfeited $ 35.41
Ending Balance $ 35.41