Changes in Accumulated Other Comprehensive Income (Loss) by Component - Cumulative Other Comprehensive Loss in Accompanying Consolidated Statements of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,264,625
Other comprehensive (loss) income before reclassifications	(84,089)	$ 7,145
Foreign currency translation effect	4,708	(1,460)
Income tax effect	8,841	245
Amount reclassified from accumulated other comprehensive income (loss)	(510)	62
Income tax effect	(1,765)	(1,953)
Other comprehensive (loss) income	(64,430)	13,170
Ending balance	1,177,712
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(447,580)	(461,589)
Ending balance	(512,010)	(448,419)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(58,186)	(62,133)
Other comprehensive (loss) income before reclassifications	(48,998)	8,328
Other comprehensive (loss) income	(48,998)	8,328
Ending balance	(107,184)	(53,805)
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(549)	2,150
Other comprehensive (loss) income before reclassifications	(3,601)	(1,183)
Income tax effect	984	245
Amount reclassified from accumulated other comprehensive income (loss)	(510)	62
Income tax effect	53	88
Other comprehensive (loss) income	(3,074)	(788)
Ending balance	(3,623)	1,362
Post- retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(388,845)	(401,606)
Other comprehensive (loss) income before reclassifications	(31,490)
Foreign currency translation effect	4,708	(1,460)
Income tax effect	7,857
Income tax effect	(1,818)	(2,041)
Other comprehensive (loss) income	(12,358)	5,630
Ending balance	(401,203)	(395,976)
Net Prior Service
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive income (loss)	236	(102)
Actuarial Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amount reclassified from accumulated other comprehensive income (loss)	$ 8,149	$ 9,233