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Summary of Options Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options outstanding | shares 1,869
Options outstanding, Weighted average remaining life in years 4 years 1 month
Options outstanding, Weighted-average exercise price $ 13.46
Number of Options exercisable | shares 872
Options exercisable, Weighted average exercise price $ 11.11
Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 9.27
Range of exercise prices, maximum $ 9.88
Number of Options outstanding | shares 396
Options outstanding, Weighted average remaining life in years 1 year 11 months
Options outstanding, Weighted-average exercise price $ 9.71
Number of Options exercisable | shares 396
Options exercisable, Weighted average exercise price $ 9.71
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 382
Options outstanding, Weighted average remaining life in years 3 years 1 month
Options outstanding, Weighted-average exercise price $ 11.71
Number of Options exercisable | shares 255
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 467
Options outstanding, Weighted average remaining life in years 5 years 1 month
Options outstanding, Weighted-average exercise price $ 12.20
Number of Options exercisable | shares 95
Options exercisable, Weighted average exercise price $ 12.20
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 289
Options outstanding, Weighted average remaining life in years 4 years 1 month
Options outstanding, Weighted-average exercise price $ 13.49
Number of Options exercisable | shares 126
Options exercisable, Weighted average exercise price $ 13.49
Range Five  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, minimum 21.60
Range of exercise prices, maximum $ 21.60
Number of Options outstanding | shares 335
Options outstanding, Weighted average remaining life in years 6 years 1 month
Options outstanding, Weighted-average exercise price $ 21.60
Number of Options exercisable | shares 0
Options exercisable, Weighted average exercise price $ 0.00