Employee Benefits - Accumulated Benefit Obligation (Detail) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
U.S Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation — end of year	$ 600,634	$ 574,612
Projected benefit obligation	54,030	65,101
Accumulated benefit obligation	54,030	65,101
Fair value of plan assets	$ 0	$ 9,389
Discount rate	3.68%	4.20%
Rate of compensation increase	3.25%	3.25%
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation — end of year	$ 941,158	$ 865,585
Projected benefit obligation	542,843	895,566
Accumulated benefit obligation	510,939	865,585
Fair value of plan assets	$ 461,496	$ 790,218
Discount rate	2.15%	2.14%
Rate of compensation increase	1.98%	1.97%