Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance			$ (246,088)
Ending Balance	$ (277,175)		(277,175)
Cumulative currency translation adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(144,899)	$ (120,386)	(141,255)	$ (95,485)
Other comprehensive income (loss) before reclassifications	(28,652)	(14,623)	(32,296)	(39,524)
Ending Balance	(173,551)	(135,009)	(173,551)	(135,009)
Benefit plan liabilities [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	(105,935)	(105,060)	(104,375)	(100,749)
Other comprehensive income (loss) before reclassifications	1,634	(6)	(714)	1,784
Amounts reclassified from accumulated other comprehensive income (loss)	612	662	1,400	(5,439)
Ending Balance	(103,689)	(104,404)	(103,689)	(104,404)
Fair value change of derivatives [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance	1,623	(1,077)	(458)	(1,397)
Other comprehensive income (loss) before reclassifications	(1,109)	1,736	1,819	2,638
Amounts reclassified from accumulated other comprehensive income (loss)	(449)	(255)	(1,296)	(837)
Ending Balance	65	404	65	404
Accumulated other comprehensive loss [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Ending Balance	$ (277,175)	$ (239,009)	$ (277,175)	$ (239,009)