Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Benefit Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,714	$ 2,743	$ 3,683
Interest cost	9,977	7,990	8,762
Expected return on plan assets	(13,424)	(10,996)	(10,747)
Amortization of:
Prior service cost (credit)	44	371	854
Actuarial loss	3,324	5,440	4,183
Curtailment (gain) loss	(887)	1,303	0
Net cost	748	6,851	6,735
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	314	0	0
Interest cost	2,250	2,394	2,695
Expected return on plan assets	(2,461)	(2,681)	(3,157)
Amortization of:
Prior service cost (credit)	0	0	0
Actuarial loss	670	845	599
Curtailment (gain) loss	0	0	0
Net cost	773	558	137
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	504	384	505
Interest cost	722	474	688
Expected return on plan assets	0	0	0
Amortization of:
Prior service cost (credit)	(1,277)	(672)	(441)
Actuarial loss	36	26	104
Curtailment (gain) loss	0	0	0
Net cost	$ (15)	$ 212	$ 856