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Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - Postretirement Benefit Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned(1)	$ 603	$ 568	$ 755
Interest cost on projected benefit obligation(2)	1,781	2,265	2,460
Net amortization of deferrals(2)	(4,655)	(4,919)	(5,497)
Net periodic benefit cost	(2,271)	(2,086)	$ (2,282)
Net actuarial loss (gain)	4,944	3,941
Recognized actuarial loss	(1,309)	(1,132)
Recognized prior service credit	5,964	6,051
Total (gain) loss recognized in OCI (before tax effects)	$ 9,599	$ 8,860

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