Pensions and Other Post-retirement Benefits - Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Funded Status
Noncurrent assets	$ 75,066	$ 57,568
Noncurrent liabilities	(186,697)	(166,101)
Pension Benefits
Change in Benefit Obligations
Benefit obligations at January 1	525,520	560,385
Service cost	10,342	11,125	$ 11,023
Interest cost	18,803	17,214	18,450
Participant contributions	470	97
Actuarial losses (gains)	81,132	(29,181)
Benefits paid	(24,452)	(23,724)
Curtailments	0	2,151
Settlements	(7,265)	(726)
Currency translation	(999)	(7,519)
Benefit obligations at December 31	603,551	525,520	560,385
Change in Plan Assets
Fair value of plan assets at January 1	443,112	492,677
Actual return on plan assets	98,210	(26,804)
Employer contributions	5,537	4,718
Participant contributions	470	97
Settlements	(7,265)	(726)
Benefits paid	24,452	23,724
Administrative Expenses Paid	(297)	(704)
Currency translation	543	(2,422)
Fair value of plan assets at December 31	515,858	443,112	492,677
Funded Status
Funded status at December 31	(87,693)	(82,408)
Unrecognized transition losses	4	5
Unrecognized prior service credit	1,572	(687)
Unrecognized net actuarial losses	183,733	178,640
Net amount recognized	97,616	95,550
Noncurrent assets	75,066	57,568
Current liabilities	(5,944)	(5,741)
Noncurrent liabilities	(156,815)	(134,231)
Net amount recognized	(87,693)	(82,404)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	183,733	178,640
Prior service credit	1,572	(687)
Unrecognized net initial obligation	4	5
Total (before tax effects)	185,309	177,958
Accumulated Benefit Obligations for all Defined Benefit Plans	558,183	489,159
Other Benefits
Change in Benefit Obligations
Benefit obligations at January 1	28,477	22,027
Service cost	354	369	403
Interest cost	996	793	882
Participant contributions	380	302
Actuarial losses (gains)	1,319	7,841
Benefits paid	(3,375)	(2,855)
Curtailments	0	0
Settlements	0	0
Currency translation	0	0
Benefit obligations at December 31	28,151	28,477	22,027
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	2,995	2,553
Participant contributions	380	302
Settlements	0	0
Benefits paid	3,375	2,855
Administrative Expenses Paid	0	0
Currency translation	0	0
Fair value of plan assets at December 31	0	0	$ 0
Funded Status
Funded status at December 31	(28,151)	(28,477)
Unrecognized transition losses	0	0
Unrecognized prior service credit	(1,519)	(1,924)
Unrecognized net actuarial losses	12,547	12,096
Net amount recognized	(17,123)	(18,305)
Noncurrent assets	0	0
Current liabilities	(2,406)	(2,736)
Noncurrent liabilities	(25,745)	(25,741)
Net amount recognized	(28,151)	(28,477)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	12,547	12,096
Prior service credit	(1,519)	(1,924)
Unrecognized net initial obligation	0	0
Total (before tax effects)	11,028	10,172
Accumulated Benefit Obligations for all Defined Benefit Plans	$ 0	$ 0