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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Personal Lines | Agency
Segment Reporting Information [Line Items]
Underwriting Margin	14.90%	10.30%	14.90%	11.70%
Combined Ratio	85.10%	89.70%	85.10%	88.30%
Personal Lines | Direct
Segment Reporting Information [Line Items]
Underwriting Margin	12.00%	7.70%	13.10%	8.50%
Combined Ratio	88.00%	92.30%	86.90%	91.50%
Operating Segments
Segment Reporting Information [Line Items]
Underwriting Margin	12.20%	8.10%	12.50%	9.60%
Combined Ratio	87.80%	91.90%	87.50%	90.40%
Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Underwriting Margin	13.40%	9.00%	14.00%	10.10%
Combined Ratio	86.60%	91.00%	86.00%	89.90%
Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Underwriting Margin	12.80%	6.30%	12.70%	11.30%
Combined Ratio	87.20%	93.70%	87.30%	88.70%
Operating Segments | Property
Segment Reporting Information [Line Items]
Underwriting Margin	(11.80%)	(2.30%)	(14.80%)	(3.10%)
Combined Ratio	111.80%	102.30%	114.80%	103.10%
Combined ratio amortization points	0.032	0.040	0.033	0.045

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