Common Stock, Preferred Stock and Equity Plans (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) vote $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (shares)	500,000,000	300,000,000
Common stock, votes per share (votes per share) | vote	1
Preferred stock, shares authorized (shares)	1,000,000	1,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Awards Outstanding (shares)	14,168,915
Additional awards authorized for grant (shares)	14,124,989
Grant price of outstanding restricted stock and restricted stock units (usd per share) | $ / shares		$ 0.01	$ 0.01
Stock Options
Stock options outstanding at beginning of period (in shares)	12,003,000
Stock options granted (in shares)	3,531,000
Stock options exercised (in shares)	(3,289,000)
Stock options forfeited (in shares)	(1,100,000)
Stock options outstanding at end of period (in shares)	11,145,000	12,003,000
Stock options exercisable at end of period (in shares)	5,541,000
Total exercisable or expected to vest, stock options (in shares)	10,461,000
Weighted-average Exercise Price
Weighted-average exercise price outstanding at beginning of period (usd per share) | $ / shares	$ 56.81
Weighted average exercise price, granted (usd per share) | $ / shares	119.09
Weighted average exercise price, exercised (usd per share) | $ / shares	50.34
Weighted average exercise price, forfeited (usd per share) | $ / shares	81.77
Weighted-average exercise price outstanding at end of period (usd per share) | $ / shares	75.99	$ 56.81
Weighted average exercise price exercisable at the end of the period (usd per share) | $ / shares	56.85
Total exercisable or expected to vest, weighted average exercise price (usd per share) | $ / shares	$ 74.11
Weighted-average Remaining Contractual Life
Weighted-average Remaining Contractual Life, outstanding (in years)	7 years 1 month 24 days
Weighted-average Remaining Contractual Life, exercisable (in years)	5 years 9 months 18 days
Weighted-average Remaining Contractual Life, total exercisable or expected to vest (in years)	7 years 15 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding | $	$ 567,531
Aggregate intrinsic value, exercisable | $	385,214
Aggregate intrinsic value, total exercisable or expected to vest | $	$ 551,593
Total Intrinsic Value and Cash Received
Market price (usd per share) | $ / shares	$ 126.26
Total intrinsic value of stock options exercised | $	$ 252,900	$ 316,500	$ 291,600
Total cash received from employees as a result of employee stock option exercises | $	$ 165,600	$ 255,500	$ 246,800
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Grant price of outstanding restricted stock and restricted stock units (usd per share) | $ / shares	$ 0.01
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period (years)	10 years
2013 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	5,851,040
Additional awards authorized for grant (shares)	14,124,989
Additional shares authorized (shares)	7,800,000	9,500,000
Number of shares authorized (shares)			3,300,000
2006 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	8,274,211
Additional awards authorized for grant (shares)	0
1996 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	43,664
Additional awards authorized for grant (shares)	0