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Summary of Options Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options outstanding | shares 1,907
Options outstanding, Weighted average remaining life in years 4 years 5 months
Options outstanding, Weighted-average exercise price $ 11.54
Number of Options exercisable | shares 776
Options exercisable, Weighted average exercise price $ 10.65
Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 5.40
Range of exercise prices, maximum $ 9.88
Number of Options outstanding | shares 540
Options outstanding, Weighted average remaining life in years 2 years 7 months
Options outstanding, Weighted-average exercise price $ 9.51
Number of Options exercisable | shares 429
Options exercisable, Weighted average exercise price $ 9.42
Range Two  
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 527
Options outstanding, Weighted average remaining life in years 4 years
Options outstanding, Weighted-average exercise price $ 11.71
Number of Options exercisable | shares 260
Options exercisable, Weighted average exercise price $ 11.71
Range Three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 12.20
Range of exercise prices, maximum $ 12.20
Number of Options outstanding | shares 495
Options outstanding, Weighted average remaining life in years 6 years 1 month
Options outstanding, Weighted-average exercise price $ 12.20
Number of Options exercisable | shares 0
Options exercisable, Weighted average exercise price $ 0.00
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 345
Options outstanding, Weighted average remaining life in years 5 years
Options outstanding, Weighted-average exercise price $ 13.49
Number of Options exercisable | shares 87
Options exercisable, Weighted average exercise price $ 13.49