Other Income (Expense) - Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Nonoperating Income Expense [Abstract]
Foreign currency transaction gains (losses)	$ (72)	$ 48	$ (257)	$ (1,558)
Gains (losses) on derivative instruments not designated as hedges	(42)	(164)	(7)	(410)
Other miscellaneous income (expense)	(917)	97	(1,614)	(787)
Other income (expense)	92	1,797	(230)	(2,996)
Other Income (Expense), Net [Member]
Other Nonoperating Income Expense [Abstract]
Net investment gains (losses) on investments held in rabbi trust	$ 1,123	$ 1,816	$ 1,648	$ (241)