Employee Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 763	$ 0	$ 2,337
Interest cost	506	589	1,476	1,864
Return on plan assets	(739)	(828)	(2,161)	(2,627)
Amortization of prior service cost	0	25	0	78
Recognized net actuarial loss	264	35	775	110
Settlement and curtailment gains	(620)	0	(620)	0
Net pension benefit cost (gain)	(589)	584	(530)	1,762
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1,662	0	4,986
Interest cost	2,148	2,389	6,445	7,167
Return on plan assets	(2,941)	(3,097)	(8,823)	(9,291)
Amortization of prior service cost	0	30	0	88
Recognized net actuarial loss	366	1,099	1,098	3,299
Settlement and curtailment gains	0	0	0	0
Net pension benefit cost (gain)	$ (427)	$ 2,083	$ (1,280)	$ 6,249