Employee Benefits - Changes in Postretirement Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 82,714	$ 79,845
Service cost for benefits earned	755	718	$ 852
Interest cost on projected benefit obligation	2,460	2,710	3,326
Actuarial (gain) loss	(6,677)	2,895
Plan amendments	(14,862)	0
Adjustments for expense/tax contained in service cost	0	0
Plan participants’ contributions	435	457
Benefits paid	(5,200)	(3,911)
Curtailments / settlements	0	0
Translation adjustments	0	0
Acquisitions/Transferred Liabilities	0	0
Other	0	0
Benefit obligation at end of year	59,625	82,714	79,845
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	5,200
U.S Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	532,381
U.S Plans [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	602,783	577,332
Service cost for benefits earned	1,971	2,175	2,497
Interest cost on projected benefit obligation	19,393	20,075	24,096
Actuarial (gain) loss	(33,284)	33,808
Plan amendments	0	93
Adjustments for expense/tax contained in service cost	0	0
Plan participants’ contributions	0	0
Benefits paid	(32,093)	(30,700)
Curtailments / settlements	0	0
Translation adjustments	0	0
Acquisitions/Transferred Liabilities	3,273	0
Other	0	0
Benefit obligation at end of year	562,043	602,783	577,332
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	581,917	525,964
Actual return on plan assets	(23,339)	81,530
Employer contributions	3,524	5,123
Plan participants’ contributions	0	0
Benefits paid	(32,093)	(30,700)
Settlements	0	0
Translation adjustments	0	0
Acquisitions/Transferred Assets	2,372	0
Other	0	0
Fair value of plan assets at end of year	532,381	581,917	525,964
Funded status at end of year	(29,662)	(20,866)
Non-U.S. Plans [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	973,061	895,566
Service cost for benefits earned	18,738	18,652	15,210
Interest cost on projected benefit obligation	17,704	17,116	24,413
Actuarial (gain) loss	(29,433)	(28,552)
Plan amendments	2,776	0
Adjustments for expense/tax contained in service cost	(1,290)	(1,287)
Plan participants’ contributions	2,047	1,700
Benefits paid	(33,862)	(28,943)
Curtailments / settlements	(2,751)	(6,787)
Translation adjustments	(49,027)	105,596
Acquisitions/Transferred Liabilities	48,356	0
Other	11,616	0
Benefit obligation at end of year	957,935	973,061	895,566
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	929,810	792,138
Actual return on plan assets	6,699	39,423
Employer contributions	18,238	36,645
Plan participants’ contributions	2,047	1,700
Benefits paid	(33,862)	(28,943)
Settlements	(1,564)	(6,787)
Translation adjustments	(47,247)	95,634
Acquisitions/Transferred Assets	21,672	0
Other	989	0
Fair value of plan assets at end of year	896,782	929,810	$ 792,138
Funded status at end of year	$ (61,153)	$ (43,251)