Stock-Based Compensation - Summary of Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Stock Option Activity [Line Items]
Exercise price range, lower range limit	$ 6.21	$ 6.21	$ 6.21
Exercise price range, upper range limit	$ 40.28	$ 40.28	$ 40.28
Number of Options Outstanding	60,876
Weighted Average Remaining Contractual Life	1 year 4 months 24 days	1 year 10 months 24 days	2 years 9 months 18 days
Weighted Average Exercise Price	$ 33.11
Number of Options Exercisable	60,876
Options Exercisable, Weighted Average Exercise Price	$ 33.11
Price Range One [Member]
Schedule Of Stock Option Activity [Line Items]
Exercise price range, lower range limit	$ 6.21
Exercise price range, upper range limit	$ 8.00
Number of Options Outstanding	2,700
Weighted Average Remaining Contractual Life	1 year 10 months 24 days
Weighted Average Exercise Price	$ 6.21
Number of Options Exercisable	2,700
Options Exercisable, Weighted Average Exercise Price	$ 6.21
Price Range Two [Member]
Schedule Of Stock Option Activity [Line Items]
Exercise price range, lower range limit	$ 16.01
Exercise price range, upper range limit	$ 20.00
Number of Options Outstanding	2,845
Weighted Average Remaining Contractual Life	10 months 24 days
Weighted Average Exercise Price	$ 17.74
Number of Options Exercisable	2,845
Options Exercisable, Weighted Average Exercise Price	$ 17.74
Price Range Three [Member]
Schedule Of Stock Option Activity [Line Items]
Exercise price range, lower range limit	$ 32.01
Exercise price range, upper range limit	$ 36.00
Number of Options Outstanding	51,863
Weighted Average Remaining Contractual Life	1 year 4 months 24 days
Weighted Average Exercise Price	$ 34.87
Number of Options Exercisable	51,863
Options Exercisable, Weighted Average Exercise Price	$ 34.87
Price Range Four [Member]
Schedule Of Stock Option Activity [Line Items]
Exercise price range, lower range limit	$ 40.01
Exercise price range, upper range limit	$ 44.00
Number of Options Outstanding	3,468
Weighted Average Remaining Contractual Life	9 months 18 days
Weighted Average Exercise Price	$ 40.28
Number of Options Exercisable	3,468
Options Exercisable, Weighted Average Exercise Price	$ 40.28