Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency contracts	$ 743,649	$ 734,257	$ 2,242,030	$ 2,245,729
Interest Expense	(34,844)	(33,497)	(99,046)	(102,662)
Tax	$ 19,269	$ 27,059	61,265	81,033
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax			647	946
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Foreign currency contracts
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency contracts			5,174	7,565
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Interest rate swaps
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Interest Expense			(644)	(644)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(13,044)	4,991
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(573)	(14,003)
Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax			3,218	1,283
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total			3,883	5,975
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total			$ (10,399)	$ (7,729)