Stock Incentive Plans - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	533,524
$3.45 - $5.18 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	57,517
Range of Exercise Prices, Minimum	$ 3.45
Range of Exercise Prices, Maximum	$ 5.18
Weighted Average Exercise Price	$ 4.32
Weighted Average Remaining Contractual Years	5 years 3 months 29 days
$5.19 - $7.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	159,503
Range of Exercise Prices, Minimum	$ 5.19
Range of Exercise Prices, Maximum	$ 7.78
Weighted Average Exercise Price	$ 6.14
Weighted Average Remaining Contractual Years	5 years 2 months 16 days
$7.79 - $11.68 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 7.79
Range of Exercise Prices, Maximum	$ 11.68
Weighted Average Remaining Contractual Years	0 years
$11.69 - $17.54 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	259,927
Range of Exercise Prices, Minimum	$ 11.69
Range of Exercise Prices, Maximum	$ 17.54
Weighted Average Exercise Price	$ 12.67
Weighted Average Remaining Contractual Years	3 years 1 month 10 days
$17.55 - $26.32 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	16,375
Range of Exercise Prices, Minimum	$ 17.55
Range of Exercise Prices, Maximum	$ 26.32
Weighted Average Exercise Price	$ 18.51
Weighted Average Remaining Contractual Years	0 years
$26.33 - $36.42 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable	40,202
Range of Exercise Prices, Minimum	$ 26.33
Range of Exercise Prices, Maximum	$ 36.42
Weighted Average Exercise Price	$ 32.81
Weighted Average Remaining Contractual Years	9 months 15 days