Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,406,352	$ 3,428,052
Other comprehensive loss before reclassifications	(353,524)	(73,997)
Less: Amounts reclassified from accumulated other comprehensive (loss) income	2,434	6,429
Net current-period other comprehensive loss	(355,958)	(80,426)
Ending balance	3,008,392	3,387,045
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,471)	(21,253)
Other comprehensive loss before reclassifications	0	0
Less: Amounts reclassified from accumulated other comprehensive (loss) income	124	(426)
Net current-period other comprehensive loss	(124)	426
Ending balance	(5,595)	(20,827)
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(56,696)	54,234
Ending balance	(412,654)	(26,192)
Unrealized Gains and (Losses) on Cash Flow Hedges | Unrealized Gains and (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	7,361	29,815
Other comprehensive loss before reclassifications	0	0
Less: Amounts reclassified from accumulated other comprehensive (loss) income	3,809	5,948
Net current-period other comprehensive loss	(3,809)	(5,948)
Ending balance	3,552	23,867
Unrealized Gains and (Losses) on Available for Sale Securities | Unrealized Gains and (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(58,586)	45,672
Other comprehensive loss before reclassifications	(353,524)	(73,997)
Less: Amounts reclassified from accumulated other comprehensive (loss) income	(1,499)	907
Net current-period other comprehensive loss	(352,025)	(74,904)
Ending balance	$ (410,611)	$ (29,232)