Accumulated Other Comprehensive Loss - Net Change and Ending Balances for Various Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 92,969	$ 161,761
Net Change	5,146	1,691
Ending Balance	83,734	165,286
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(18,642)	(11,932)
Net Change	449	2,498
Ending Balance	(18,193)	(9,434)
Unrecognized Employee Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(30,902)	(34,196)
Net Change	4,310	(283)
Ending Balance	(26,592)	(34,479)
Realized (Gains) Losses from Settlement of Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(64)	739
Net Change	387	(524)
Ending Balance	323	215
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(49,608)	(45,389)
Net Change	5,146	1,691
Ending Balance	$ (44,462)	$ (43,698)