Stock-Based Compensation - Additional Information (Detail) - USD ($)		12 Months Ended
	Apr. 25, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under 2013 Plan (in shares)		1,339,106	1,547,980
Stock-based compensation expense recognized		$ 3,700,000	$ 3,000,000	$ 3,200,000
Stock-based compensation expense after tax		$ 2,500,000	$ 2,000,000	$ 2,200,000
Non-statutory stock options, granted (in shares)	750,000
Non-statutory stock options, vesting percentage after second year	40.00%
Non-statutory stock options, vesting percentage in each of following three years	20.00%
Non-statutory stock options, exercise price over December 2012 market value, percent	20.00%
Non eligibility period of receiving grants under any of other stock based award programs		5 years
Weighted-average risk-free rate of return		1.95%	1.25%	1.54%
Expected option life		5 years 3 months	5 years 3 months 18 days	4 years 10 months 24 days
Expected stock price volatility rate		24.90%	29.60%	25.00%
Assumed dividend yield		0.60%	0.80%	0.76%
Granted (in dollars per share)		$ 11.50	$ 7.84	$ 5.73
Aggregate intrinsic value of options exercised		$ 7,500,000	$ 5,000,000	$ 3,000,000
Total unrecognized compensation cost of nonvested stock options		$ 800,000
Expected weighted-average period		1 year 8 months 9 days
Non-Vested Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 1,800,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 0
Stock awards vesting period		5 years
Restricted stock granted (in shares)		66,750
Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vest in percentage per annum increments		25.00%
Share-based Compensation Award, Tranche One | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period		5 years
Share-based Compensation Award, Tranche One | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period		7 years
Share-Based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vest in percentage per annum increments			25.00%
Share-Based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vest in percentage per annum increments				25.00%
Stock Incentive 2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under 2013 Plan (in shares)		2,096,535
Shares available for future grants under 2013 Plan (in shares)		472,690
Stock Incentive 2013 Plan | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock options issued (in shares)					450,000
Non-Plan Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average risk-free rate of return		0.76%
Expected option life		5 years
Expected stock price volatility rate		40.50%
Assumed dividend yield		1.01%
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 1,200,000
Restricted stock granted (in shares)		36,573
Weighted average fair value, granted (in dollars per share)		$ 47.05	$ 29.94	$ 26.13
Total compensation cost to be recognized		$ 2,100,000
Weighted average remaining contractual term		2 years 6 months 12 days
Total fair value, vested		$ 1,200,000	$ 1,400,000	$ 1,300,000
Restricted Stock and Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting period		4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 400,000
Performance award vesting period		4 years
Restricted stock granted (in shares)					108,546
Aggregate shares of restricted stock awarded (in shares)		233,400
Percentage of annual return on assets					1.00%
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vest in percentage per annum increments		25.00%