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Summary of Options Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options outstanding | shares 2,139
Options outstanding, Weighted average remaining life in years 4 years 4 months
Options outstanding, Weighted-average exercise price $ 10.57
Number of Options exercisable | shares 961
Options exercisable, Weighted average exercise price $ 9.07
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 $ 9.40
Number of Options outstanding | shares 640
Options outstanding, Weighted average remaining life in years 2 years 4 months
Options outstanding, Weighted-average exercise price $ 8.18
Number of Options exercisable | shares 569
Options exercisable, Weighted average exercise price $ 8.05
Range Two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 9.88
Range of exercise prices, maximum $ 9.88
Number of Options outstanding | shares 498
Options outstanding, Weighted average remaining life in years 4 years 1 month
Options outstanding, Weighted-average exercise price $ 9.88
Number of Options exercisable | shares 245
Options exercisable, Weighted average exercise price $ 9.88
Range Three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 11.71
Range of exercise prices, maximum $ 11.71
Number of Options outstanding | shares 590
Options outstanding, Weighted average remaining life in years 5 years 1 month
Options outstanding, Weighted-average exercise price $ 11.71
Number of Options exercisable | shares 147
Options exercisable, Weighted average exercise price $ 11.71
Range Four  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 13.49
Range of exercise prices, maximum $ 13.49
Number of Options outstanding | shares 411
Options outstanding, Weighted average remaining life in years 6 years 1 month
Options outstanding, Weighted-average exercise price $ 13.49
Number of Options exercisable | shares 0
Options exercisable, Weighted average exercise price $ 0.00