Summary of Options Outstanding (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options outstanding	1,961
Options outstanding, Weighted average remaining life in years	3 years 11 months
Options outstanding, Weighted-average exercise price	$ 8.20
Number of Options exercisable	1,001
Options exercisable, Weighted average exercise price	$ 6.92
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	$ 1.13
Range of exercise prices, maximum	$ 8.37
Number of Options outstanding	684
Options outstanding, Weighted average remaining life in years	1 year 11 months
Options outstanding, Weighted-average exercise price	$ 5.67
Number of Options exercisable	684
Options exercisable, Weighted average exercise price	$ 5.67
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	$ 8.47
Range of exercise prices, maximum	$ 9.27
Number of Options outstanding	642
Options outstanding, Weighted average remaining life in years	4 years 7 months
Options outstanding, Weighted-average exercise price	$ 9.00
Number of Options exercisable	235
Options exercisable, Weighted average exercise price	$ 8.90
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum	$ 9.40
Range of exercise prices, maximum	$ 14.50
Number of Options outstanding	635
Options outstanding, Weighted average remaining life in years	5 years 5 months
Options outstanding, Weighted-average exercise price	$ 10.11
Number of Options exercisable	82
Options exercisable, Weighted average exercise price	$ 11.65