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Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 604,003
Weighted Average Remaining Contractual Life in Years 3 years 10 months 24 days
Weighted average exercise price (in usd per share) $ 7
$2-$4  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in usd per share) 2
Range of exercise prices, upper range limit (in usd per share) $ 4
Number of options outstanding (in shares) | shares 40,870
Weighted Average Remaining Contractual Life in Years 2 years 10 months 24 days
Weighted average exercise price (in usd per share) $ 3
4-6  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in usd per share) 4
Range of exercise prices, upper range limit (in usd per share) $ 6
Number of options outstanding (in shares) | shares 284,912
Weighted Average Remaining Contractual Life in Years 5 years 1 month 6 days
Weighted average exercise price (in usd per share) $ 5
6-10  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in usd per share) 6
Range of exercise prices, upper range limit (in usd per share) $ 10
Number of options outstanding (in shares) | shares 42,094
Weighted Average Remaining Contractual Life in Years 7 years 7 months 6 days
Weighted average exercise price (in usd per share) $ 7
10-18  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in usd per share) 10
Range of exercise prices, upper range limit (in usd per share) $ 18
Number of options outstanding (in shares) | shares 236,127
Weighted Average Remaining Contractual Life in Years 1 year 10 months 24 days
Weighted average exercise price (in usd per share) $ 12