Changes in Accumulated Other Comprehensive Income (Loss) by Component - Cumulative Other Comprehensive Loss in Accompanying Consolidated Statements of Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,172,043
Other comprehensive (loss) income before reclassifications	(11,542)	$ (4,240)
Foreign currency translation effect	(2,668)	(264)	$ (7,855)
Income tax effect	804	(1,455)
Amount reclassified from accumulated other comprehensive income (loss)	(1,141)	(2,412)
Pension settlement charges	4,262	0	0
Prior service effect of plan amendment	(3,069)	(3,704)	0
Income tax effect	(9,083)	(7,698)
Other comprehensive (loss) income	14,009	16,889
Ending balance	1,264,625	1,172,043
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(461,589)	(478,478)
Ending balance	(447,580)	(461,589)	(478,478)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(62,133)	(39,940)
Other comprehensive (loss) income before reclassifications	3,947	(22,193)
Other comprehensive (loss) income	3,947	(22,193)
Ending balance	(58,186)	(62,133)	(39,940)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,150	349
Other comprehensive (loss) income before reclassifications	(2,612)	5,040
Income tax effect	804	(1,213)
Amount reclassified from accumulated other comprehensive income (loss)	(1,141)	(2,412)
Income tax effect	250	386
Other comprehensive (loss) income	(2,699)	1,801
Ending balance	(549)	2,150	349
Post- retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(401,606)	(438,887)
Other comprehensive (loss) income before reclassifications	(12,877)	12,913
Foreign currency translation effect	(2,668)	(264)
Income tax effect		(242)
Pension settlement charges	4,262
Prior service effect of plan amendment	(3,069)	(3,704)
Income tax effect	(9,333)	(8,084)
Other comprehensive (loss) income	12,761	37,281
Ending balance	(388,845)	(401,606)	$ (438,887)
Net Prior Service
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive income (loss)	603	(541)
Actuarial Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive income (loss)	$ 35,843	$ 37,203