Accumulated Comprehensive Loss - Accumulated Comprehensive Income (Activity) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (39,654)	$ (37,288)
Net current period change	(9,581)	(2,852)
Reclassification adjustments for losses reclassified into income	390	486
Ending balance	(48,845)	(39,654)
Foreign currency items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(21,079)	(16,507)
Net current period change	(3,234)	(4,572)
Reclassification adjustments for losses reclassified into income	0	0
Ending balance	(24,313)	(21,079)
Pension and postretirement benefits plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(18,575)	(20,781)
Net current period change	(6,347)	1,720
Reclassification adjustments for losses reclassified into income	390	486
Ending balance	$ (24,532)	$ (18,575)