Pensions and Post-Retirement Benefit Plans - Schedule of Weighted Average Asset Allocation for Company's Pension Plans (Detail)	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total asset allocation	100.00%	100.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total asset allocation	70.00%	72.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total asset allocation	24.00%	24.00%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total asset allocation	6.00%	4.00%