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, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 149,834
Net Change	2,978	$ 1,390
Ending balance	147,467
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(22,973)	(8,393)
Net Change	2,252	(315)
Ending balance	(20,721)	(8,708)
Unrecognized Employee Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(38,636)	(49,943)
Net Change	478	1,434
Ending balance	(38,158)	(48,509)
Unrealized Holding Gains on Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	59	692
Net Change	179	118
Ending balance	238	810
Realized Gains/Losses from Settlement of Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	551	45
Net Change	69	153
Ending balance	620	198
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(60,999)	(57,599)
Net Change	2,978	1,390
Ending balance	$ (58,021)	$ (56,209)