Retirement Plans - Domestic Retirement Plan's Financial Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - United States - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 53,602	$ 48,163
Interest cost	1,420	1,858
Actuarial loss	6,632	7,075
Benefits paid	(4,270)	(3,494)
Benefit obligation, end of year	57,384	53,602
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of year	0	0
Employer contribution	4,270	3,494
Benefits paid	(4,270)	(3,494)
Fair value of plan assets, end of year	0	0
Funded status, end of year	(57,384)	(53,602)
Amounts recognized in the consolidated balance sheets
Other current liabilities	(3,933)	(3,929)
Other liabilities	(53,451)	(49,672)
Accumulated other comprehensive loss	25,492	19,732
Net amount recognized	(31,892)	(33,869)
Accumulated benefit obligation	$ 57,384	$ 53,602
Weighted average assumptions used to determine benefit obligation
Discount rate	1.95%	2.75%