Stock-Based Compensation - Summary of Range of Exercise Prices of Stock Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option Outstanding, Exercise Price, Lower Range Limit	$ 17.94
Exercisable, Exercise Price, Lower Range Limit	$ 17.94
Not Exercisable, Exercise Price, Lower Range Limit
Options Outstanding, Exercise Price, Upper Range Limit	$ 36.29
Exercisable, Exercise Price, Upper Range Limit	$ 36.29
Not Exercisable, Exercise Price, Upper Range Limit
Options Outstanding, Number of Options	295,627
Exercisable, Number of Options	295,627
Not Exercisable, Number of Options
Options Outstanding, Weighted Average Remaining Life (years)	1 year 6 months
Exercisable, Weighted Average Remaining Life (years)	1 year 6 months
Not Exercisable, Weighted Average Remaining Life (years)	0 years
Options Outstanding, Weighted Average Exercise Price	$ 21.62
Exercisable, Weighted Average Exercise Price	$ 21.62
Not Exercisable, Weighted Average Exercise Price
Exercise Price Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option Outstanding, Exercise Price, Lower Range Limit	$ 17.94
Options Outstanding, Exercise Price, Upper Range Limit	$ 18.21
Options Outstanding, Number of Options	50,204
Options Outstanding, Weighted Average Remaining Life (years)	8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 18.20
Exercise Price Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option Outstanding, Exercise Price, Lower Range Limit	$ 18.21
Options Outstanding, Exercise Price, Upper Range Limit	$ 23.77
Options Outstanding, Number of Options	175,483
Options Outstanding, Weighted Average Remaining Life (years)	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 20.91
Exercise Price Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option Outstanding, Exercise Price, Lower Range Limit	$ 23.77
Options Outstanding, Exercise Price, Upper Range Limit	$ 36.29
Options Outstanding, Number of Options	69,940
Options Outstanding, Weighted Average Remaining Life (years)	2 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 25.87