Segment Information - Information by Business Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segments
Total revenue	$ 160,555	$ 127,085	$ 110,276
Cost of revenue	77,776	64,086	51,317
Other operating and corporate expenses	22,906	21,389	20,557
Depreciation, depletion and amortization	12,788	10,287	8,998
Investment income, net	4,983	10,714	12,150
Interest expense	13,564	12,302	11,840
Gain on land contribution to equity method investment	19,983	2,317
Other (expense) income, net	1,329	4,133	1,152
Income before equity in loss from unconsolidated affiliates and income taxes	59,816	36,185	30,866
Equity in loss from unconsolidated affiliates	(666)	(77)
Capital expenditures	162,243	114,286	45,196
Investment in unconsolidated joint ventures	37,965	5,084
Total assets	1,037,324	909,233
Interest income from investments in SPEs	8,180	8,190	8,197
Interest expense from Senior Notes issued by SPE	(8,813)	(8,801)	(8,788)
Latitude Margaritaville Watersound JV
Segments
Gain on land contribution to equity method investment	15,700
Equity in loss from unconsolidated affiliates	(524)	(71)
Investment in unconsolidated joint ventures	24,288	791
Gain on land contributed	15,300
Sea Sound Apartments JV
Segments
Investment in unconsolidated joint ventures	10,348
Gain on land contributed	3,900
Busy Bee JV (SJBB, LLC)
Segments
Equity in loss from unconsolidated affiliates	(30)
Investment in unconsolidated joint ventures	1,180	1,210
Gain on land contributed		800
Pier Park TPS JV
Segments
Gain on land contribution to equity method investment		1,500
Equity in loss from unconsolidated affiliates	(112)	(6)
Investment in unconsolidated joint ventures	2,149	3,083
Gain on land contributed		1,400
Residential
Segments
Equity in loss from unconsolidated affiliates	(524)	(71)
Investment in unconsolidated joint ventures	24,287	791
Commercial
Segments
Equity in loss from unconsolidated affiliates	(142)	(6)
Investment in unconsolidated joint ventures	13,678	4,293
Operating Segments | Residential
Segments
Total revenue	74,715	41,586	43,266
Cost of revenue	30,359	20,492	10,215
Other operating and corporate expenses	5,283	4,873	4,717
Depreciation, depletion and amortization	318	283	288
Interest expense	683	717	867
Gain on land contribution to equity method investment	15,706
Other (expense) income, net	(22)	(217)	(508)
Income before equity in loss from unconsolidated affiliates and income taxes	53,998	15,144	26,919
Capital expenditures	33,634	28,639	15,865
Total assets	172,610	139,349
Operating Segments | Residential | Mattamy - RiverTown sale | Real estate - Impact fees
Segments
Total revenue			23,100
Operating Segments | Hospitality
Segments
Total revenue	47,374	45,720	39,576
Cost of revenue	34,670	33,924	33,385
Other operating and corporate expenses	1,180	838	533
Depreciation, depletion and amortization	4,638	4,579	3,640
Interest expense	222	30	4
Other (expense) income, net	575	225	(259)
Income before equity in loss from unconsolidated affiliates and income taxes	7,238	6,574	1,817
Capital expenditures	42,770	15,923	7,400
Total assets	146,724	89,570
Operating Segments | Commercial
Segments
Total revenue	36,665	38,823	24,620
Cost of revenue	12,228	9,593	7,494
Other operating and corporate expenses	3,681	3,479	3,567
Depreciation, depletion and amortization	6,987	5,253	4,925
Interest expense	3,836	2,739	2,180
Gain on land contribution to equity method investment	3,949	2,244
Other (expense) income, net	51	1,190	(362)
Income before equity in loss from unconsolidated affiliates and income taxes	13,988	21,239	6,101
Capital expenditures	85,070	69,219	21,552
Total assets	332,649	253,936
Operating Segments | Residential and commercial
Segments
Investment income, net	298	184	320
Other
Segments
Total revenue	1,801	956	2,814
Cost of revenue	519	77	223
Other operating and corporate expenses	12,762	12,199	11,740
Depreciation, depletion and amortization	845	172	145
Investment income, net	4,685	10,530	11,830
Interest expense	8,823	8,816	8,789
Gain on land contribution to equity method investment	328	73
Other (expense) income, net	725	2,935	2,281
Income before equity in loss from unconsolidated affiliates and income taxes	(15,408)	(6,772)	(3,971)
Capital expenditures	769	505	379
Total assets	385,341	426,378
Interest income from investments in SPEs	8,200	8,200	8,200
Interest expense from Senior Notes issued by SPE	$ (8,800)	$ (8,800)	(8,800)
Other | Mitigation bank credit
Segments
Total revenue			$ 2,200