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Summary of Stock Option Activity (Detail) (Employee Stock Option, USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Employee Stock Option
     
Options Outstanding Number of Shares      
Outstanding at beginning of period     4,350,631
Granted     253,650
Exercised     (524,243)
Forfeited     (273,401)
Outstanding at end of period 3,806,637   3,806,637
Exercisable at end of period 2,203,758   2,203,758
Weighted Average Exercise Price      
Outstanding at beginning of period     $ 23.01
Granted     $ 32.95
Exercised     $ 20.11
Forfeited     $ 25.47
Outstanding at end of period $ 23.89   $ 23.89
Exercisable at end of period $ 24.40   $ 24.40
Weighted Average Fair Value      
Outstanding at beginning of period     $ 9.17
Granted $ 12.06 $ 9.72 $ 12.05
Exercised     $ 8.17
Forfeited     $ 10.04
Outstanding at end of period $ 9.44   $ 9.44
Exercisable at end of period $ 8.86   $ 8.86
Weighted Average Remaining Contractual Life      
Outstanding at end of period     4 years 6 months 18 days
Exercisable at end of period     3 years 3 months 26 days