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Summary of Stock Option Activity (Detail) (Stock Option And Award Plans, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Option And Award Plans
      
Options Granted Under Plans      
Beginning balance 4,350,631 4,902,818 4,798,677
Granted 264,950 842,273 989,449
Exercised (1,249,759) (890,236) (430,340)
Cancelled (392,034) (504,224) (454,968)
Ending Balance 2,973,788 4,350,631 4,902,818
Vested and exercisable at end of period 1,505,707    
Number of Shares      
Beginning balance 4,350,631 4,902,818 4,798,677
Granted 264,950 842,273 989,449
Exercised (1,249,759) (890,236) (430,340)
Cancelled (392,034) (504,224) (454,968)
Ending balance 2,973,788 4,350,631 4,902,818
Vested and exercisable at end of period 1,505,707    
Weighted Average Exercise Price      
Beginning balance $ 23.01 $ 21.87 $ 21.71
Granted $ 33.09 $ 22.01 $ 19.66
Exercised $ 21.60 $ 14.62 $ 10.84
Cancelled $ 25.27 $ 25.14 $ 25.77
Ending balance $ 24.20 $ 23.01 $ 21.87
Vested and exercisable at end of period $ 24.92    
Weighted Average Grant Date Fair Value      
Beginning balance $ 9.17 $ 8.61 $ 8.47
Granted $ 12.05 $ 9.59 $ 8.20
Exercised $ 8.58 $ 6.16 $ 4.80
Cancelled $ 10.02 $ 9.76 $ 9.87
Ending balance $ 9.57 $ 9.17 $ 8.61
Vested and exercisable at end of period $ 8.64