Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issuable upon exercise of outstanding options		212,077		383,216	541,263	851,082
Estimated pretax compensation expense		$ 18.0
Expiration period in years		4 years
Restricted stock units settled in shares exercisable in percentage		25.00%
Deferred stock units outstanding		58,000
Total stock-based compensation expense		$ 11.7		$ 10.2	$ 8.1
Non-Employee Directors' Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period in years		10 years
Employee stock options exercisable in percentage		100.00%
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period in years		10 years
Service period in years		4 years
Stock Options [Member] | Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards settled in stock exercisable in percentage		25.00%
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares to reduce shares available to grant by upon vesting of deferred restricted stock awards and units		1,195,584	[1]	1,391,169	1,531,206	1,614,210
Service period in years		4 years
Granted, Units	[1]	689,138		495,529	741,223
Maximum Payout Percentage		200.00%
Performance-based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares to reduce shares available to grant by upon vesting of deferred restricted stock awards and units		150,292		192,024	226,954
Service period in years		3 years
2016 Incentive Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock subject to awards of stock options or stock appreciation rights payable in shares		1
Common stock subject to any other form of award		1.35
Common stock available for future share-based awards		3,300,000
Shares issuable upon exercise of outstanding options		200,000
Number of shares to reduce shares available to grant by upon vesting of deferred restricted stock awards and units		2,400,000
2008 Incentive Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares to reduce shares available to grant by upon vesting of deferred restricted stock awards and units		100,000

[1] (1) 150,292, 192,024 and 226,954 of performance-based restricted stock units granted during 2025, 2024 and 2023, respectively, and which are still outstanding as of December 31, 2025, are subject to a 200% maximum payout based on certain performance metrics.