Federal, State and Local Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal corporate income tax rate	21.00%	35.00%	35.00%
Income tax benefit due to change in tax rate		$ 42,000
Outstanding amount of the investment	$ 62,300	46,200
Other commitments of additional anticipated equity contributions relating to current investments	37,200	23,900
Affordable housing tax credits and other tax benefits recognized	5,200	4,500	$ 4,000
Affordable housing tax credits and other tax benefits, related amortization recognized	4,700	3,100	3,000
Unrecognized gross tax benefits	33,357	33,681	33,487	$ 30,456
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized	26,400
Income tax benefit attributed to interest and penalties	1,700	1,800	1,200
Accrued interest and penalties on tax liabilities	11,300	8,900
Net deferred tax liabilities	79,110	84,797
Tax expense	135,252	$ 202,014	$ 281,727
Maximum
Income Taxes [Line Items]
Estimated change in balance of unrecognized tax benefit, within next twelve months	20,000
New Jersey Division of Taxation [Member]
Income Taxes [Line Items]
Tax expense	2,100
Special Federal Tax Provision
Income Taxes [Line Items]
Tax bad debt base-year reserves	61,500
Net deferred tax liabilities	$ 12,900