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Derivative Financial Instruments - Schedule gains (losses) recorded as component of other comprehensive income (loss) in connection with cash flow hedges (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Opening balance, before-tax amount $ (7,883) $ (54,335) $ (10,921) $ (4,126)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, before-tax amount 2,443 (3,996) 6,361 (4,909)
Changes in fair value of effective portion of outstanding derivatives, net 11,984 20,550 18,940 (30,572)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax, Total 9,541 24,546 12,579 (25,663)
Closing balance, before-tax amount 1,658 (29,789) 1,658 (29,789)
Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Tax 1,355 9,994 1,861 (1,466)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, tax (expense) or benefit (526) 1,029 (1,463) 722
Net gains (losses) reclassified into statement of income on completion of hedged transactions, before-tax amount (2,278) (3,661) (3,721) 7,492
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax (1,752) (4,690) (2,258) 6,770
Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Tax (397) 5,304 (397) 5,304
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax (6,528) (44,341) (9,060) (5,592)
Net gains (losses) reclassified into statement of income on completion of hedged transactions, net of tax amount 1,917 (2,967) 4,898 (4,187)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax 9,706 16,889 15,219 (23,080)
Net income (loss) on cash flow hedging derivatives, net of taxes (Note 7) 7,789 19,856 10,321 (18,893)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax $ 1,261 $ (24,485) $ 1,261 $ (24,485)