Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure
Net actuarial (gain) loss	$ (3,203)	$ 17,732	$ 46,564
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	2,302	2,462	2,218
Interest cost	13,630	13,142	12,875
Expected return on plan assets	(13,830)	(14,517)	(12,500)
Amortization of prior service cost	96	134	135
Net actuarial (gain) loss	(4,013)	10,596	43,168
Total net periodic pension (income) cost	(1,815)	11,817	45,896
Prior service cost	(96)	(134)	(135)
Total recognized in other comprehensive income	(96)	(134)	(135)
Total recognized in net periodic pension (income) cost and other comprehensive income	(1,911)	11,683	45,761
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	761	1,006	897
Interest cost	1,185	1,444	1,837
Expected return on plan assets	(443)	(781)	(868)
Net actuarial (gain) loss	815	8,415	4,651
Curtailment		(634)
Total net periodic pension (income) cost	2,318	9,450	6,517
Total recognized in net periodic pension (income) cost and other comprehensive income	2,318	9,450	6,517
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	37	48	59
Interest cost	218	237	335
Amortization of prior service cost	(607)	(598)	(598)
Net actuarial (gain) loss	5	(648)	(1,255)
Total net periodic pension (income) cost	(347)	(961)	(1,459)
Prior service benefit	(93)
Prior service credit	607	598	598
Total recognized in other comprehensive income	514	598	598
Total recognized in net periodic pension (income) cost and other comprehensive income	$ 167	$ (363)	$ (861)