Pensions - Schedule of Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plans' assets at beginning of period	$ 312,711
Fair value of plans' assets at end of period	299,419	$ 312,711
Funded status of the plans	4,564
UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligations at beginning of year	25,633	34,824
Service cost	118	308	$ 314
Interest cost	864	1,198	1,297
Actuarial loss (gain)	1,697	(9,227)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,491	1,475
Foreign currency exchange rate effect	0	0
Other	20	5
Benefit obligation at end of year	22,436	25,633	34,824
Funded status of the plans	(22,436)	(25,633)
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligations at beginning of year	21,981	24,242
Service cost	397	495	423
Interest cost	752	789	693
Actuarial loss (gain)	1,705	(1,130)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	570	495
Foreign currency exchange rate effect	1,136	(1,920)
Other	61	0
Benefit obligation at end of year	23,949	21,981	24,242
Funded status of the plans	(23,949)	(21,981)
Pension Plan [Member] | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligations at beginning of year	288,223	315,698
Service cost	809	852	814
Interest cost	10,955	10,824	11,700
Actuarial loss (gain)	28,771	(21,684)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	14,625	17,467
Foreign currency exchange rate effect	0	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	58,198	0
Defined Benefit Plan, Benefit Obligation, Business Combination	0	0
Other	0	0
Benefit obligation at end of year	255,935	288,223	315,698
Fair value of plans' assets at beginning of period	265,019	275,767
Actual return on plans' assets	50,488	(16,631)
Employer contributions	1,929	23,350
Defined Benefit Plan, Plan Assets, Benefits Paid	14,625	17,467
Foreign currency exchange rate effect	0	0
Settlements	(58,198)	0
Defined Benefit Plan, Plan Assets, Business Combination	0	0
Fair value of plans' assets at end of period	244,613	265,019	275,767
Funded status of the plans	(11,322)	(23,204)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligations at beginning of year	183,850	197,169
Service cost	3,893	4,383	4,025
Interest cost	4,037	4,207	4,341
Actuarial loss (gain)	17,756	(3,001)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	6,038	7,125
Foreign currency exchange rate effect	11	(10,697)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	2,263	4,974
Defined Benefit Plan, Benefit Obligation, Business Combination	(16,953)	2,778
Other	71	1,110
Benefit obligation at end of year	184,364	183,850	197,169
Fair value of plans' assets at beginning of period	47,692	52,026
Actual return on plans' assets	6,948	(746)
Employer contributions	6,646	9,136
Defined Benefit Plan, Plan Assets, Benefits Paid	6,038	7,125
Foreign currency exchange rate effect	2,399	(4,014)
Settlements	(2,841)	(3,730)
Defined Benefit Plan, Plan Assets, Business Combination	0	2,145
Fair value of plans' assets at end of period	54,806	47,692	$ 52,026
Funded status of the plans	$ (129,558)	$ (136,158)