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Land and Subsurface Interests - Additional Information (Detail) ft² in Millions							1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 27, 2016 USD ($) a $ / a	Apr. 13, 2016 USD ($) a item	Mar. 30, 2016 USD ($) a $ / a	Feb. 12, 2016 USD ($) a $ / a	Jun. 17, 2015 USD ($) a	Jun. 01, 2015 USD ($) a $ / a	May 31, 2016 USD ($)	Sep. 30, 2016 USD ($) a	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) a county $ / a	Sep. 30, 2015 USD ($)	Sep. 30, 2016 ft²	Sep. 30, 2016	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) a	Jun. 30, 2015 a
Real Estate Properties [Line Items]
Area of a real estate property								1,581			1,581		1.5			148.35
Area of Land \| a								10,500			10,500
Gain (Loss) from sale of land								$ 11,479,490		$ 3,763,140	$ 12,842,438	$ 3,781,329
Percentage of infrastructure work completed														95.00%
Other Assets															$ 8,584,059	$ 6,034,824
Impairment Charges											$ 2,180,730	510,041
Subsurface interest area of land \| a											500,000
Subsurface Interest in number of countries \| county											20
Amended oil exploration lease term											The terms of the lease state the Company will receive royalty payments if production occurs, and may receive additional annual rental payments if the lease is continued in years seven and eight.
Lease income recognized from oil exploration lease								297,000		456,000	$ 904,000	1,400,000
Area on which royalties received \| a											800
Oil royalty income recognized								$ 16,000		$ 11,000	$ 32,000	60,000
Payments for release of surface entry rights											$ 450,000	$ 2,000
Gross proceeds from release of surface entry rights							$ 450,000
Town Center Sales Agreements
Real Estate Properties [Line Items]
Area of a real estate property \| a								235			235
Cost of the contract															12,800,000
Amount of contractual obligation															4,500,000
Other Assets															$ 4,000,000	$ 1,300,000
NADG
Real Estate Properties [Line Items]
Area of a real estate property \| a								81.50			81.50
Revenue from land sold											$ 20,200,000
Revenue per acre \| $ / a											248,000
Daytona Beach, Florida
Real Estate Properties [Line Items]
Area of a real estate property \| a								6			6					6
South of LPGA Boulevard East of Clyde Morris Boulevard [Member]
Real Estate Properties [Line Items]
Revenue from land sold						$ 505,000
Revenue per acre \| $ / a						167,000
Highlands County [Member]
Real Estate Properties [Line Items]
Revenue from land sold					$ 250,000
Hendry County Florida
Real Estate Properties [Line Items]
Area of a real estate property \| a								960			960
Land [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a																	3.9
Land [Member] \| South of LPGA Boulevard East of Clyde Morris Boulevard [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a						3.0
Gain (Loss) from sale of land						$ 476,000
Land [Member] \| Highlands County [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a					0.9
Gain (Loss) from sale of land					$ 223,000
Undeveloped Land [Member]
Real Estate Properties [Line Items]
Impairment Charges											$ 1,000,000
Developable Land \| Town Center Sales Agreements
Real Estate Properties [Line Items]
Area of a real estate property \| a								180			180
2016 Disposals \| Sold
Real Estate Properties [Line Items]
Revenue from land sold											$ 2,400,000
Impairment Charges									$ 210,000
2016 Disposals \| Sold \| Town Center Sales Agreements
Real Estate Properties [Line Items]
Area of a real estate property \| a	4.50
Revenue from land sold	$ 205,000		$ 2,000,000
Revenue per acre \| $ / a	46,000		455,000
Gain (Loss) from sale of land	$ 126,000
2016 Disposals \| Sold \| Daytona Beach, Florida
Real Estate Properties [Line Items]
Revenue from land sold				$ 190,000
Revenue per acre \| $ / a				62,000
2016 Disposals \| Sold \| Land [Member]
Real Estate Properties [Line Items]
Area of a real estate property \| a								11.96			11.96
2016 Disposals \| Sold \| Land [Member] \| Town Center Sales Agreements
Real Estate Properties [Line Items]
Area of a real estate property \| a			4.40
Gain (Loss) from sale of land			$ 1,250,000
Remaining gain (loss) from sale of land			$ 683,000
2016 Disposals \| Sold \| Land [Member] \| Daytona Beach, Florida
Real Estate Properties [Line Items]
Area of a real estate property \| a				3.06
Gain (Loss) from sale of land				$ 145,000
2016 Disposals \| Under contract to be sold \| Land, Underlying Subsurface Interests [Member] \| Land Venture Partners, LLC [Member]
Real Estate Properties [Line Items]
Subsurface interest area of land \| a		500,000
Number of oil wells \| item		2
Sale price of subsurface interest area of land		$ 24,000,000