Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
US federal statutory rate	21.00%	21.00%	21.00%
Change in valuation allowance	(1.00%)		(2.00%)
Other	(1.00%)	(2.00%)
Effective income tax rate	19.00%	19.00%	18.00%
Charges And Credits
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
Charges and credits (See Note 3)			(1.00%)