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Federal, State and Local Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]            
Income tax expense $ 50,500,000 $ 14,915,000 $ 76,695,000 $ 128,264,000 $ 135,252,000  
CARES Act allowance of net operating losses     5 years      
Outstanding amount of the investment     $ 84,500,000 57,100,000    
Other commitments of additional anticipated equity contributions relating to current investments     54,200,000 29,100,000    
Affordable housing tax credits and other tax benefits recognized     7,500,000 5,900,000 5,200,000  
Affordable housing tax credits and other tax benefits, related amortization recognized     6,200,000 5,200,000 4,700,000  
Impairment losses on other assets     0 0 0  
Unrecognized gross tax benefits     37,820,000 35,749,000 33,357,000 $ 33,681,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized     29,900,000      
Income tax benefit attributed to interest and penalties     2,800,000 2,500,000 1,700,000  
Accrued interest and penalties on tax liabilities     18,400,000 14,500,000    
Net deferred tax liabilities     419,890,000 $ 201,431,000    
Special Federal Tax Provision            
Income Taxes [Line Items]            
Tax bad debt base-year reserves     61,500,000      
Net deferred tax liabilities     12,900,000      
Maximum            
Income Taxes [Line Items]            
Estimated change in balance of unrecognized tax benefit, within next twelve months     21,000,000      
CARES Act            
Income Taxes [Line Items]            
Income tax expense     68,400,000      
New Jersey Division of Taxation [Member]            
Income Taxes [Line Items]            
Income tax expense         $ 2,100,000  
Domestic Tax Authority            
Income Taxes [Line Items]            
Net operating loss carryforward     $ 83,900,000      
Operating loss carryforward period     20 years