Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Costs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S. Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 411	$ 346
Interest cost	2,098	2,258
Expected return on plan assets	(3,127)	(3,011)
Amortization of prior service cost	13	105
Amortization of actuarial loss	936	1,128
Net benefit costs	331	826
Foreign Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	90	31
Interest cost	445	568
Expected return on plan assets	(538)	(647)
Amortization of actuarial loss	181	176
Net benefit costs	178	128
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	172	158
Interest cost	172	200
Amortization of prior service cost	(405)	(258)
Amortization of actuarial loss	8	37
Net benefit costs	$ (53)	$ 137