Employee Benefits - Reconciliation of Level 3 Non-U.S. Plan Assets Held (Detail) - Pension Plan [Member] - Non-U.S. Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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
Fair value of plan assets at end of year	896,782	929,810
Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	72,758
Actual return on plan assets	(3,532)
Purchases, sales and settlements	25,791
Fair value of plan assets at end of year	95,017	72,758
Real Estate [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	39,165
Actual return on plan assets	(2,155)
Purchases, sales and settlements	32,094
Fair value of plan assets at end of year	69,104	39,165
Hedge Funds [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	33,593
Actual return on plan assets	(1,377)
Purchases, sales and settlements	(6,303)
Fair value of plan assets at end of year	$ 25,913	$ 33,593