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Fair Value of Stock Option (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Grant Date Fair Value      
Granted $ 9.63 $ 9.98 $ 9.47
Ending balance $ 11.76    
Restricted Stock Units (RSUs)
     
Restricted Shares Outstanding Shares      
Beginning balance 1,250,082    
Grants assumed in Merger 978,756    
Granted 863,310    
Vested (1,420,511)    
Forfeited (78,359)    
Ending Balance 1,593,278    
Weighted Average Grant Date Fair Value      
Beginning balance $ 30.49    
Grants assumed in Merger $ 38.85    
Granted $ 41.56    
Vested $ 33.17    
Forfeited $ 37.22    
Ending balance $ 38.97