Pension Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Amount of contributions to contributory plan	$ 82,100,000	$ 73,900,000	$ 72,000,000
Accumulated benefit obligation	78,400,000	85,600,000
Fair value of plan assets exceeded accumulated benefit obligation	15,000,000.0	$ 12,800,000
Estimated net loss that will be amortized from accumulated other comprehensive income over the next fiscal year	0
Estimated prior service cost that will be amortized from accumulated other comprehensive income over the next fiscal year	$ 0