Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency contracts	$ 716,931	$ 745,329	$ 1,498,381	$ 1,511,472
Interest Expense	(32,062)	(32,593)	(64,202)	(69,165)
Tax	$ 15,699	$ 30,612	41,996	53,974
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax			474	670
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			3,794	5,365
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			(429)	(432)
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			(8,696)	3,328
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			(383)	(9,335)
Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax			2,187	820
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			2,891	4,263
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total			$ (6,892)	$ (5,187)