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Schedule of Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Investment income	$ 12,556	$ 12,162	$ 21,662	$ 34,712
Investment income (loss)	12,556
Investment expense	(810)	(814)	(2,146)	(2,319)
Net investment income	11,746	11,348	19,516	32,393
Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Investment income	7,421	8,806	25,013	27,692
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Investment income	1,390	1,704	4,161	4,384
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Investment income	260	372	492	1,242
Other Invested Assets
Debt Securities, Available-for-sale [Line Items]
Investment income	$ 3,485	$ 1,280	$ (8,004)	$ 1,394

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Investment income (loss) interest and dividend.

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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Aggregate amount of net income allocated to limited partners.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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