Employee Benefit Plans - Summary of Changes in Benefit Obligation and Plan Assets for Defined Benefit Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Amount Recognized in Consolidated Balance Sheets:
Noncurrent accrued benefit liability, net	$ (225,957)	$ (212,280)
Amounts Recognized in Accumulated Other Comprehensive Loss:
Tax benefits related to changes in benefit obligation and plan assets which are also included in accumulated other comprehensive loss	83,000	84,500
Defined benefit pension plans
Change in Benefit Obligation:
Benefit obligation, beginning of year	628,152	567,502
Service cost	4,348	4,479	$ 4,223
Interest cost	15,079	19,309	18,117
Impact of currency exchange rate changes	9,076	1,500
Actuarial loss	45,907	72,353
Benefits paid	(33,447)	(36,991)
Plan amendments	2,066	0
Benefit obligation, end of year	671,181	628,152	567,502
Change in Plan Assets:
Plan assets at fair value, beginning of year	431,747	401,929
Actual return on plan assets	44,104	60,721
Employer contributions	10,937	3,670
Impact of currency exchange rate changes	4,769	2,418
Benefits paid	(33,447)	(36,991)
Settlements	(230)	0
Plan assets at fair value, end of year	457,880	431,747	401,929
Net Amount Recognized in Consolidated Balance Sheets:
Funded status, end of year	(213,301)	(196,405)
Current accrued benefit liability	(5,687)	(4,593)
Noncurrent accrued benefit liability, net	(207,614)	(191,812)
Net amount recognized	(213,301)	(196,405)
Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss (gain)	279,338	266,714
Prior service cost (credit)	148	182
Total amount recognized in accumulated other comprehensive loss, before tax	279,486	266,896
Postretirement benefit plans
Change in Benefit Obligation:
Benefit obligation, beginning of year	5,781	6,201
Service cost	1	1	1
Interest cost	139	201	208
Impact of currency exchange rate changes	0	0
Actuarial loss	773	1,486
Benefits paid	(448)	(2,108)
Plan amendments	0	0
Benefit obligation, end of year	6,246	5,781	6,201
Change in Plan Assets:
Plan assets at fair value, beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	448	2,108
Impact of currency exchange rate changes	0	0
Benefits paid	(448)	(2,108)
Settlements	0	0
Plan assets at fair value, end of year	0	0	$ 0
Net Amount Recognized in Consolidated Balance Sheets:
Funded status, end of year	(6,246)	(5,781)
Current accrued benefit liability	(840)	(750)
Noncurrent accrued benefit liability, net	(5,406)	(5,031)
Net amount recognized	(6,246)	(5,781)
Amounts Recognized in Accumulated Other Comprehensive Loss:
Net actuarial loss (gain)	(351)	(1,201)
Prior service cost (credit)	(10,148)	(12,186)
Total amount recognized in accumulated other comprehensive loss, before tax	$ (10,499)	$ (13,387)