Other Income (Loss), Net - Schedule of Other Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ 3,498	$ 4,411	$ 4,588
Nonoperating pension income (expense)	1,680	7,997	4,641
(Loss) Gain on asset dispositions, net	(236)	(371)	646
Other, net	742	(943)	(644)
Total other income, net	$ 5,684	$ 11,094	$ 9,231