Share-Based Compensation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) Deferral shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted under incentive plan | shares	57,639
Deferred shares and held by the rabbi trust | shares	243,118	245,386
Incentive Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards | shares	100,000
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses	$ 900,000	$ 700,000	$ 500,000
Compensation cost expected to be recognized over period	$ 900,000
Weighted-average period	1 year 8 months 12 days
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period	1 year 8 months 12 days
Performance-based compensation expense (income)	$ 3,800,000	3,600,000	3,400,000
Remaining compensation expense	4,400,000
Service and Performance-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits from restricted share awards	$ 2,600,000	$ 300,000	$ 200,000
2016 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards | shares				1,000,000
Incentive plan expiry date	May 10, 2026
2016 Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	5 years
2016 Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under plan vest and expire	10 years
2016 Incentive Plan [Member] | After One Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage	50.00%
2016 Incentive Plan [Member] | After Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage	75.00%
2016 Incentive Plan [Member] | After Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting percentage	100.00%
2016 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards | shares				900,000
Restricted shares granted under incentive plan | shares	507,912
2016 Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards | shares				100,000
Granted, Number of Shares | shares	70,000
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of deferrals | Deferral	2
2016 Incentive Plan Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares | shares	0	26,500	3,000
Compensation expenses	$ 300,000	$ 300,000	$ 200,000
Weighted-average period	1 year 6 months
Estimated Forfeitures	$ 0
Exercised, Number of Shares | shares	37,800	13,150	7,000
Total intrinsic value of stock options	$ 3,500,000	$ 300,000	$ 200,000
Cash received for the exercise of stock options	2,200,000	800,000
Expected compensation cost related to unvested awards not yet recognized	200,000
Excess tax benefits	$ 2,400,000
2016 Incentive Plan Stock Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits		$ 100,000	$ 100,000