Revenue and Income (Loss) Before Income Taxes - Net Sales and Income (Loss) Before Income Taxes (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue And Income Loss Before Income Taxes [Abstract]
Corporate costs	$ 3,267	$ 2,509	$ 6,518	$ 5,298