Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Employer contribution of employee’s eligible earnings, percentage		10.00%
Pension settlement charge, net of post settlement adjustments	$ 6,330	$ 6,403
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge, net of post settlement adjustments	6,300
Reversion of excess pension plan assets	55,500
Amount transferred to suspense account to fund future 401(k) contributions	14,100
Accruing of excise taxes	8,300
Available for general corporate purposes	$ 33,100