Income Taxes - Reconciliations of Statutory U.S. Federal Income Tax Rates to Our Effective Tax Rate for Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%
Non-deductible regulatory-related expenses		1.40%
Unrecognized tax benefits, state, net of federal benefit	(1.30%)	0.20%	0.90%
State tax, net of federal benefit	2.20%	1.00%	0.70%
Other, net	0.10%	(0.20%)
Effective tax rate	22.00%	23.40%	22.60%