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Segment Information - Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Under- writing Margin	10.50%	11.00%	12.70%	10.90%
Combined Ratio	89.50%	89.00%	87.30%	89.10%
Operating Segments \| Personal Lines
Segment Reporting Information [Line Items]
Under- writing Margin	10.50%	10.90%	12.90%	11.00%
Combined Ratio	89.50%	89.10%	87.10%	89.00%
Operating Segments \| Commercial Lines
Segment Reporting Information [Line Items]
Under- writing Margin	10.80%	11.30%	12.20%	10.30%
Combined Ratio	89.20%	88.70%	87.80%	89.70%