Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) plan $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan	2
Options, Granted (in shares) \| shares	176,940
Weighted-average fair value of grants (in dollars per share) \| $ / shares	$ 12.87
Outstanding at end of period, Weighted average remaining contractual term	6 years 11 months
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	750,000
Shares reserved for future issuance (in shares) \| shares	750,000
Discount from market price, offering date	15.00%
Maximum percentage of employee compensation for purchase of common stock	10.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted (in shares) \| shares	176,940	129,400	123,500
Weighted-average fair value of grants (in dollars per share) \| $ / shares	$ 12.87	$ 11.88	$ 6.53
Expiration period from date of grant	10 years
Aggregate intrinsic value of stock options exercised	$ 1.3	$ 2.5	$ 1.3
Cash received from the exercise of options	1.8	4.3	2.1
Tax benefits realized for the tax deductions from options exercised	$ 0.3	0.9	0.5
Options vested (in shares) \| shares	363,225
Weighted average exercise price (in dollars per share) \| $ / shares	$ 28.33
Aggregate intrinsic value	$ 2.9
Outstanding at end of period, Weighted average remaining contractual term	6 years 11 months
Share-based compensation expense	$ 0.9	0.7	0.8
Unrecognized compensation cost related to stock option	$ 2.5
Weighted average period	2 years 5 months
Total fair value of options expensed before tax benefits	$ 0.8	0.8	0.9
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Share-based compensation expense	$ 2.1	$ 2.0	$ 1.8
Weighted average period	1 year 11 months
Awards, Granted (in shares) \| shares	81,230	135,350	139,450
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 32.36	$ 28.97	$ 15.97
Vesting percentage in year one	33.00%
Vesting percentage in year two	33.00%
Vesting percentage in year three	34.00%
Compensation not yet recognized	$ 3.0
Fair value of awards vested in period	2.7	$ 3.0	$ 1.3
Tax benefit realized on vesting of options	0.6	1.1	0.7
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1.9	$ 2.0	$ 0.4
Weighted average period	1 year 8 months 12 days
Awards, Granted (in shares) \| shares	64,700	126,000	62,500
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 35.16	$ 26.31	$ 15.92
Compensation not yet recognized	$ 3.1
Fair value of awards vested in period	0.3	$ 1.2	$ 1.1
Tax benefit realized on vesting of options	$ 0.1	$ 0.5	$ 0.2
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance other than stock options (in shares) \| shares	337,693
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	1,690,000
Shares reserved for future issuance (in shares) \| shares	490,930
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	4 years

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Tax Benefit For Exercise Of Stock Options and Issuance Of Shares Upon Vesting Of Restricted Stock Grants

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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