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Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Expected tax provision at weighted average tax rate	$ (1,985)	$ (1,001)	$ (8,270)	$ 3,380
Adjustments:
Tax exempt interest	(1)	0	(2)	(1)
Dividend exclusion	(86)	(33)	(198)	(256)
Non-deductible interest	416	695	1,773	2,063
Change in tax status	(1,704)	0	(1,704)	0
Parent income treated as partnership for tax	(146)	0	(146)	0
Other	297	22	374	(23)
Total income tax expense (benefit)	$ (3,209)	$ (317)	$ (8,173)	$ 5,163
Expected tax provision at weighted average	(10.80%)	(15.60%)	(27.20%)	(7.30%)
Adjustments:
Tax exempt interest, % of Pre-Tax Income	0.00%	0.00%	0.00%	0.00%
Dividend exclusion, % of Pre-Tax Income	(0.50%)	(0.50%)	(0.60%)	(0.60%)
Non-deductible interest, % of Pre-Tax Income	2.30%	10.80%	5.80%	(4.50%)
Change in tax status, % of Pre-Tax Income	(9.30%)	0.00%	(5.60%)	0.00%
Parent income treated as partnership for tax, % of Pre-Tax Income	(0.80%)	0.00%	(0.50%)	0.00%
Other, % of Pre-Tax Income	1.60%	0.30%	1.20%	0.00%
Effective income tax expense (benefit)	(17.50%)	(5.00%)	(26.90%)	(11.20%)

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