Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified to Net Income from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax amount	$ 29,534	$ 28,615	$ 60,417	$ 47,759
Tax (provision) benefit	6,354	6,385	12,259	11,611
Reclassification of gain (loss) to net income	23,180	22,230	48,158	36,148
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of gain (loss) to net income	(669)	1,445	(1,424)	2,391
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Cash Flow Hedging Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (provision) benefit	4	(42)	5	(70)
Reclassification of gain (loss) to net income	(672)	1,396	(1,428)	2,294
Reclassification out of Accumulated Other Comprehensive Income [Member] | Actuarial Gain (Loss) Related to Pension Liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (provision) benefit	1	4	1	7
Reclassification of gain (loss) to net income	3	27	4	53
Reclassification out of Accumulated Other Comprehensive Income [Member] | Revenues [Member] | Gain (Loss) on Cash Flow Hedging Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax amount	(676)	1,438	(1,433)	2,364
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Income (Expense), Net [Member] | Actuarial Gain (Loss) Related to Pension Liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax amount	$ 2	23	$ 3	46
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Income (Expense), Net [Member] | Gain (Loss) on Postretirement Obligation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of gain (loss) to net income		$ 22		$ 44