Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Net premiums earned	$ 54,177	$ 43,964	$ 160,664	$ 168,847
Net investment income	5,054	2,878	11,671	8,522
Net realized investment gains	1,626	(226)	6,520	2,276
Net unrealized investment (losses) gains	(390)	74	(4,547)	74
Net other-than-temporary impairment losses		(474)	(80)	(864)
Policy fee income	843	905	2,563	2,721
Other	433	369	1,504	1,207
Total revenue	61,743	47,490	178,295	182,783
Expenses:
Losses and loss adjustment expenses	25,769	89,231	67,227	142,425
Amortization of deferred policy acquisition costs	8,996	9,031	26,506	26,668
Interest expense	4,552	4,408	13,527	12,328
Loss on extinguishment of debt				743
Impairment loss		38		38
Depreciation and amortization	326	324	999	896
Other	10,177	10,476	31,789	32,256
Total expenses	49,820	113,508	140,048	215,354
Income (loss) before income taxes	11,923	(66,018)	38,247	(32,571)
Operating Segments [Member] | Insurance Operations [Member]
Revenue:
Net premiums earned	54,177	43,964	160,664	168,847
Net investment income	2,777	2,563	7,520	7,153
Net realized investment gains	1,227	(226)	4,982	2,193
Net unrealized investment (losses) gains	(478)		(3,985)
Net other-than-temporary impairment losses		(464)		(854)
Policy fee income	843	905	2,563	2,721
Other	80	85	452	428
Total revenue	58,626	46,827	172,196	180,488
Expenses:
Losses and loss adjustment expenses	25,769	89,231	67,227	142,425
Amortization of deferred policy acquisition costs	8,996	9,031	26,506	26,668
Depreciation and amortization	32	33	98	94
Other	6,187	7,155	20,135	22,601
Total expenses	40,984	105,450	113,966	191,788
Income (loss) before income taxes	17,642	(58,623)	58,230	(11,300)
Total revenue from non-affiliates	58,626	46,827	172,196	180,488
Operating Segments [Member] | Real Estate Operations [Member]
Revenue:
Net investment income		2	1	5
Other	2,318	1,761	6,965	4,964
Total revenue	2,318	1,763	6,966	4,969
Expenses:
Interest expense	393	318	1,176	880
Impairment loss		38		38
Depreciation and amortization	592	535	1,788	1,551
Other	1,166	983	3,202	2,634
Total expenses	2,151	1,874	6,166	5,103
Income (loss) before income taxes	167	(111)	800	(134)
Total revenue from non-affiliates	1,935	1,381	5,818	3,824
Operating Segments [Member] | Corporate and Other [Member]
Revenue:
Net investment income	2,377	658	3,941	2,188
Net realized investment gains	399		1,538	83
Net unrealized investment (losses) gains	88	74	(562)	74
Net other-than-temporary impairment losses		(10)	(80)	(10)
Other	1,214	1,068	3,948	3,452
Total revenue	4,078	1,790	8,785	5,787
Expenses:
Interest expense	4,270	4,128	12,700	11,543
Loss on extinguishment of debt				743
Depreciation and amortization	242	250	751	676
Other	5,452	4,696	16,117	13,962
Total expenses	9,964	9,074	29,568	26,924
Income (loss) before income taxes	(5,886)	(7,284)	(20,783)	(21,137)
Total revenue from non-affiliates	3,806	1,620	7,945	5,266
Intersegment Eliminations [Member]
Revenue:
Net investment income	(100)	(345)	209	(824)
Other	(3,179)	(2,545)	(9,861)	(7,637)
Total revenue	(3,279)	(2,890)	(9,652)	(8,461)
Expenses:
Interest expense	(111)	(38)	(349)	(95)
Depreciation and amortization	(540)	(494)	(1,638)	(1,425)
Other	(2,628)	(2,358)	(7,665)	(6,941)
Total expenses	$ (3,279)	$ (2,890)	$ (9,652)	$ (8,461)