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Land and Subsurface Interests - Additional Information (Detail) (USD $)
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0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | 6 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 21, 2013
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Sep. 22, 2013
acre
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Sep. 30, 2012
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Sep. 30, 2013
Payments
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Jun. 30, 2013
acre
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Jun. 30, 2012
|
Jun. 30, 2013
acre
|
Dec. 31, 2013
acre
Country
bbl
sqft
|
Dec. 31, 2012
bbl
|
Dec. 31, 2011
acre
bbl
|
Dec. 31, 2010
|
Dec. 31, 2009
|
Sep. 30, 2013
Maximum [Member]
|
Sep. 30, 2013
Minimum [Member]
|
Dec. 04, 2013
RaceTrac [Member]
|
Dec. 31, 2013
RaceTrac [Member]
|
Dec. 04, 2013
RaceTrac [Member]
Maximum [Member]
|
Dec. 19, 2013
Intracoastal Bank [Member]
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Dec. 21, 2013
CarMax [Member]
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Jun. 30, 2012
Interstate [Member]
|
Dec. 31, 2013
Land [Member]
acre
|
Dec. 04, 2013
Land [Member]
RaceTrac [Member]
acre
|
Dec. 04, 2013
Land [Member]
Williamson Crossing [Member]
acre
|
Dec. 19, 2013
Land [Member]
Intracoastal Bank [Member]
acre
|
Dec. 21, 2013
Land [Member]
CarMax [Member]
acre
|
Jun. 30, 2012
Land [Member]
Interstate [Member]
acre
|
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| Real Estate Properties [Line Items] | ||||||||||||||||||||||||||
| Area of land sold | 740,000 | 11.655 | 3.405 | 23 | 2.02 | 6.23 | 16.6 | |||||||||||||||||||
| Revenue from land sold | $ 3,000,000 | $ 1,300,000 | $ 640,000 | $ 1,050,000 | $ 618,000 | |||||||||||||||||||||
| Revenue per acre | 382,000 | 317,000 | 168,500 | 37,000 | ||||||||||||||||||||||
| Gain (Loss) from sale of land | 416,236 | (26,367) | 78,455 | 244,000 | 581,000 | 1,000,000 | 573,000 | |||||||||||||||||||
| Reimbursement by Williamson for RaceTrac | 976,500 | |||||||||||||||||||||||||
| Reimbursement period | 5 years | |||||||||||||||||||||||||
| Cash held in escrow related to the improvements and classified as restricted cash on the consolidated balance sheet | 283,500 | |||||||||||||||||||||||||
| Adjustment for impairment | 0 | |||||||||||||||||||||||||
| Loss on sale of land | 416,000 | |||||||||||||||||||||||||
| Impairment charges | 616,000 | 616,278 | 6,618,888 | |||||||||||||||||||||||
| Area of land used for transaction | 3.21 | 3.21 | ||||||||||||||||||||||||
| Commitment to fund for road construction costs | 1,125,000 | |||||||||||||||||||||||||
| Road construction costs amount paid | 554,196 | |||||||||||||||||||||||||
| Liability recorded for road construction cost | 570,804 | |||||||||||||||||||||||||
| Income from construction cost | 730,000 | |||||||||||||||||||||||||
| Reversal of the remaining commitment and a reimbursement | 160,000 | |||||||||||||||||||||||||
| Subsurface interest area of land | 490,000 | |||||||||||||||||||||||||
| Subsurface Interest in number of countries | 20 | |||||||||||||||||||||||||
| Area on which royalties received | 800 | |||||||||||||||||||||||||
| Oil royalty income recognized | 267,693 | 286,536 | 228,494 | |||||||||||||||||||||||
| Production of oil | 88,782 | 81,441 | 104,221 | |||||||||||||||||||||||
| Oil exploration lease period | 8 years | 8 years | ||||||||||||||||||||||||
| Oil exploration lease covering | 82,000 | 136,000 | ||||||||||||||||||||||||
| Bonus rental payment received | 922,114 | 3,293,000 | 913,657 | |||||||||||||||||||||||
| Number of payments | 2 | |||||||||||||||||||||||||
| Amount recognized into income | 1,830,000 | |||||||||||||||||||||||||
| Area removed from exploration lease | 54,000 | |||||||||||||||||||||||||
| Duration of payment during lease period | 12 months | |||||||||||||||||||||||||
| Non refundable payment | 1,000,000 | |||||||||||||||||||||||||
| Additional annual rental payments receive if lease is continued | 8 years | 4 years | ||||||||||||||||||||||||
| Lease income recognized from oil exploration lease | $ 1,600,000 | $ 919,000 | $ 251,000 | |||||||||||||||||||||||