Shareholders' Equity - Summary of Information about Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Number of shares
Outstanding Beginning Balance	17,830,164
Options granted	2,779,700
Options exercised	(1,483,190)
Options forfeited	(359,525)
Options canceled	(237,009)
Outstanding Ending Balance	18,530,140
Exercisable at December 31, 2013	8,821,695
Weighted average exercise price per share
Outstanding Beginning Balance	$ 40.51
Options granted	$ 35.33
Options exercised	$ 24.12
Options forfeited	$ 43.25
Options cancelled	$ 38.41
Outstanding Ending Balance	$ 41.02
Exercisable at December 31, 2013	$ 39.53
Weighted average remaining contractual life
Outstanding at December 31, 2013	5 years 10 months 15 days
Exercisable at December 31, 2013	3 years 7 months 2 days
Aggregate intrinsic value
Outstanding at December 31, 2013	$ 88,006
Exercisable at December 31, 2013	$ 46,729