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Derivative Financial Instruments - Cash Flow Hedges, Gains (Losses) Recorded as Component of Other Comprehensive Income (Loss) or Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Opening balance, before-tax amount		$ (4,126)	$ (2,411)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, before-tax amount		3,740	3,193
Changes in fair value of effective portion of outstanding derivatives, net, before-tax amount		(63,000)	18,402
Gain (loss) on cash flow hedging derivatives, net, before-tax amount		(66,740)	15,209
Closing balance, before-tax amount		(70,866)	12,798
Opening balance, tax (expense) or benefit	[1]	(1,466)	(5,524)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, tax (expense) or benefit	[1]	(961)	(1,571)
Changes in fair value of effective portion of outstanding derivatives, net, tax (expense) or benefit	[1]	12,674	(3,624)
Gain (loss) on cash flow hedging derivatives, net, tax (expense) or benefit	[1]	13,635	(2,053)
Closing balance, tax (expense) or benefit	[1]	12,169	(7,577)
Opening balance, net of tax amount		(5,592)	(7,935)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, net of tax amount		2,779	1,622
Changes in fair value of effective portion of outstanding derivatives, net, net of tax amount		(50,326)	14,778
Gain (loss) on cash flow hedging derivatives, net, net of taxes amount		(53,105)	13,156
Closing balance, net of tax amount		$ (58,697)	$ 5,221
[1] *The tax (expense) benefit includes the effect of novating certain hedging instruments as part of an intercompany transfer.

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Accumulated pretax change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges.

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Tax effect on accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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