Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S. Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 346	$ 1,130
Interest cost	2,258	2,070
Expected return on plan assets	(3,011)	(2,741)
Amortization of prior service cost	105	138
Amortization of actuarial loss	1,128	1,463
Curtailment charge	0	1,217
Net benefit costs	826	3,277
Foreign Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	31	0
Interest cost	568	597
Expected return on plan assets	(647)	(668)
Amortization of actuarial loss	176	210
Net benefit costs	128	139
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	158	75
Interest cost	200	112
Amortization of prior service cost	(258)	(168)
Amortization of actuarial loss	37	58
Net benefit costs	$ 137	$ 77