Pensions and Postretirement Benefits Other than Pensions - Defined Benefit Pension and Other Postretirement Benefits Plans (Detail) - USD ($) $ in Thousands		12 Months Ended
	Oct. 26, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in the balance sheets:
Postretirement benefits other than pensions		$ (227,216)	$ (236,454)
Pension Plan
Change in benefit obligation:
Projected Benefit Obligation at beginning of year		1,409,380	1,550,059
Service cost - employer		8,906	10,363
Interest cost		50,560	48,001
Actuarial (gain)/loss		162,549	(95,607)
Benefits paid		(77,718)	(81,431)
Plan Amendment		3,069	3,704
Settlements		(18,196)	0
Foreign currency translation effect		15,013	(25,709)
Projected Benefit Obligation at end of year		1,553,563	1,409,380	$ 1,550,059
Change in plans’ assets:
Fair value of plans’ assets at beginning of year		1,261,130	1,330,225
Actual return on plans’ assets		198,088	(41,654)
Employer contribution		48,899	75,113
Benefits paid		(77,718)	(81,431)
Settlements		(18,196)	0
Foreign currency translation effect		14,353	(21,123)
Fair value of plans’ assets at end of year		1,426,556	1,261,130	1,330,225
Funded status		(127,007)	(148,250)
Amounts recognized in the balance sheets:
Accrued liabilities		(300)	(300)
Postretirement benefits other than pensions		(126,707)	(147,950)
Other Postretirement Benefits
Change in benefit obligation:
Projected Benefit Obligation at beginning of year		251,798	271,726
Service cost - employer		1,573	1,948	2,003
Interest cost		9,887	9,251	10,063
Actuarial (gain)/loss		(9,664)	(19,909)
Benefits paid		(12,044)	(11,218)
Plan Amendment		0	0
Settlements		0	0
Foreign currency translation effect		0	0
Projected Benefit Obligation at end of year		241,550	251,798	271,726
Change in plans’ assets:
Fair value of plans’ assets at beginning of year		0	0
Actual return on plans’ assets		0	0
Employer contribution		0	0
Benefits paid		0	0
Settlements		0	0
Foreign currency translation effect		0	0
Fair value of plans’ assets at end of year		0	0	0
Funded status		(241,550)	(251,798)
Amounts recognized in the balance sheets:
Accrued liabilities		(14,334)	(15,344)
Postretirement benefits other than pensions		(227,216)	(236,454)
United States
Change in plans’ assets:
Fair value of plans’ assets at beginning of year		912,129
Fair value of plans’ assets at end of year		1,047,214	912,129
United States | Pension Plan
Change in benefit obligation:
Projected Benefit Obligation at beginning of year		1,004,751	1,088,633
Service cost - employer		8,906	10,363	9,860
Interest cost		39,499	36,840	39,251
Actuarial (gain)/loss		113,828	(67,543)
Benefits paid		(63,176)	(63,542)
Plan Amendment		3,069	0
Settlements		0	0
Foreign currency translation effect		0	0
Projected Benefit Obligation at end of year		1,106,877	1,004,751	1,088,633
Change in plans’ assets:
Fair value of plans’ assets at beginning of year		912,129	944,346
Actual return on plans’ assets		159,949	(33,063)
Employer contribution		38,312	64,388
Benefits paid		(63,176)	(63,542)
Settlements		0	0
Foreign currency translation effect		0	0
Fair value of plans’ assets at end of year		1,047,214	912,129	944,346
Funded status		(59,663)	(92,622)
Amounts recognized in the balance sheets:
Accrued liabilities		(300)	(300)
Postretirement benefits other than pensions		(59,363)	(92,322)
International | Pension Plan
Change in benefit obligation:
Projected Benefit Obligation at beginning of year		404,629	461,426
Service cost - employer		0	0
Interest cost		11,061	11,161	11,525
Actuarial (gain)/loss		48,721	(28,064)
Benefits paid		(14,542)	(17,889)
Plan Amendment	$ 3,704	0
Settlements	$ 0	(18,196)
Foreign currency translation effect		15,013	(25,709)
Projected Benefit Obligation at end of year		446,686	404,629	461,426
Change in plans’ assets:
Fair value of plans’ assets at beginning of year		349,001	385,879
Actual return on plans’ assets		38,139	(8,591)
Employer contribution		10,587	10,725
Benefits paid		(14,542)	(17,889)
Settlements		(18,196)	0
Foreign currency translation effect		14,353	(21,123)
Fair value of plans’ assets at end of year		379,342	349,001	$ 385,879
Funded status		(67,344)	(55,628)
Amounts recognized in the balance sheets:
Accrued liabilities		0	0
Postretirement benefits other than pensions		$ (67,344)	$ (55,628)