Changes in Accumulated Other Comprehensive (Loss) Income by Component - Cumulative Other Comprehensive Loss in Accompanying Consolidated Statements of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,388,899
Other comprehensive (loss) income before reclassifications	(11,289)	$ (84,089)
Foreign currency translation effect	(805)	4,708
Income tax effect	(99)	8,841
Income tax effect	(2,094)	(1,765)
Other comprehensive loss	(4,553)	(64,430)
Balance at end of period	1,401,381
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(446,909)	(447,580)
Balance at end of period	(451,462)	(512,010)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(43,321)	(58,186)
Other comprehensive (loss) income before reclassifications	(11,862)	(48,998)
Other comprehensive loss	(11,862)	(48,998)
Balance at end of period	(55,183)	(107,184)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(6,772)	(549)
Other comprehensive (loss) income before reclassifications	573	(3,601)
Income tax effect	(99)	984
Amount reclassified from accumulated other comprehensive (loss) income	1,334	(510)
Income tax effect	(372)	53
Other comprehensive loss	1,436	(3,074)
Balance at end of period	(5,336)	(3,623)
Post- retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(396,816)	(388,845)
Other comprehensive (loss) income before reclassifications		(31,490)
Foreign currency translation effect	(805)	4,708
Income tax effect		7,857
Income tax effect	(1,722)	(1,818)
Other comprehensive loss	5,873	(12,358)
Balance at end of period	(390,943)	(401,203)
Net Prior Service
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive (loss) income	429	236
Actuarial Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive (loss) income	$ 7,971	$ 8,149