Schedule of Options Granted, Classified into Range of Exercise Price (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Number of options	3,115,972	[1]	2,546,117
Outstanding, Weighted average remaining contractual life (years)	4 years 9 months 18 days	[1]
Outstanding, Weighted average exercise price	$ 16.30	[1]	$ 15.88
Exercisable, Number of options	1,595,611	[2]
Exercisable, Weighted average remaining contractual life (years)	3 years 2 months 12 days	[2]
Exercisable, Weighted average exercise price	$ 14.79	[2]
5.76 - 9.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower limit	$ 5.76
Range of exercise price, Upper limit	$ 9.80
Outstanding, Number of options	776,274
Outstanding, Weighted average remaining contractual life (years)	1 year 7 months 6 days
Outstanding, Weighted average exercise price	$ 8.36
Exercisable, Number of options	776,274
Exercisable, Weighted average remaining contractual life (years)	1 year 7 months 6 days
Exercisable, Weighted average exercise price	$ 8.36
11.17 - 15.54
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower limit	$ 11.17
Range of exercise price, Upper limit	$ 15.54
Outstanding, Number of options	696,544
Outstanding, Weighted average remaining contractual life (years)	5 years 1 month 6 days
Outstanding, Weighted average exercise price	$ 14.80
Exercisable, Number of options	305,053
Exercisable, Weighted average remaining contractual life (years)	4 years 8 months 12 days
Exercisable, Weighted average exercise price	$ 14.27
16.08 - 17.61
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower limit	$ 16.08
Range of exercise price, Upper limit	$ 17.61
Outstanding, Number of options	814,062
Outstanding, Weighted average remaining contractual life (years)	6 years 8 months 12 days
Outstanding, Weighted average exercise price	$ 16.44
Exercisable, Number of options	49,580
Exercisable, Weighted average remaining contractual life (years)	7 years 6 months
Exercisable, Weighted average exercise price	$ 17.21
18.23 - 32.34
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, Lower limit	$ 18.23
Range of exercise price, Upper limit	$ 32.34
Outstanding, Number of options	829,092
Outstanding, Weighted average remaining contractual life (years)	5 years 6 months
Outstanding, Weighted average exercise price	$ 24.87
Exercisable, Number of options	464,704
Exercisable, Weighted average remaining contractual life (years)	4 years 7 months 6 days
Exercisable, Weighted average exercise price	$ 25.61

[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,816,691 shares of the Company's common stock issuable upon exercise.

[2] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 1,549,633 shares of the Company's common stock issuable upon exercise.