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Common Stock - Summary of Information and Changes in Stock Options with Regard to Stock Option Plans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of shares under stock option, Beginning of the year 9,473,482 10,481,750 11,039,544
Number of Shares Granted 2,832,587 2,239,088 2,277,946
Number of Shares Exercised (1,366,459) (3,019,219) (2,594,566)
Number of Shares Cancelled (303,417) (228,137) (241,174)
Number of shares under stock option, End of the year 10,636,193 9,473,482 10,481,750
Number of stock options vested and expected to be vest 10,466,014    
Number of stock options vested and expected to be vest, exercisable 5,831,091 4,823,331 5,073,965
Weighted average exercise price, Beginning of year $ 58.69 $ 47.20 $ 38.01
Weighted Average Exercise Price, Stock Options granted $ 69.37 $ 84.58 $ 79.68
Weighted Average Exercise Price, Stock Options Cancelled $ 72.43 $ 60.28 $ 40.20
Weighted Average Exercise Price, Stock Options Exercised $ 77.44 $ 82.26 $ 36.84
Weighted Average Exercise Price, End of the year $ 63.29 $ 58.69 $ 47.20
Weighted Average Exercise Price, Stock options vested or expected to be vest $ 63.29    
Weighted Average Exercise Price, Stock options vested or expected to be vest exercisable $ 53.46 $ 43.99 $ 38.47
Weighted Remaining Contractual Term, Outstanding on Beginning 6 years 10 months 10 days    
Weighted Remaining Contractual Term, Outstanding at Ending 6 years 9 months 26 days 6 years 10 months 10 days  
Weighted Remaining Contractual Term, Vested 6 years 9 months 26 days    
Weighted Remaining Contractual Term, Exercisable 5 years 4 months 13 days    
Stock Options Aggregate Intrinsic Value, Beginning $ 150,667,018    
Stock Options Aggregate Intrinsic Value, Ending 183,849,267 150,667,018  
Stock Options Aggregate Intrinsic Value, Vested and Expected to Vest 180,907,679    
Stock Options Aggregate Intrinsic Value, Aggregate Intrinsic Value $ 155,892,094