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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal income tax	2.40%	2.30%	2.30%
Stock-based compensation windfall benefit	(2.00%)	(0.80%)	(0.50%)
Permanent difference - credits	(0.50%)	(0.60%)	(0.20%)
Permanent difference - other	0.20%	0.20%
Other	0.40%	(0.20%)	0.10%
Total effective rate for continuing operations	22.30%	22.40%	23.00%
162(m) Limitation
Income Taxes [Line Items]
Permanent difference	0.80%	0.50%	0.30%

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Income taxes.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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