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Debt (Schedule of Lines of Credit Outstanding) (Details) - Subsidiary of JBGL - Inwood National Bank - USD ($) | Jul. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Oct. 13, 2014 | Oct. 13, 2013 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings on lines of credit |  | $ 13,960,000 | $ 14,061,000 |  |  |
Direct Finance Leases A |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings on lines of credit |  | 0 | 662,000 |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 4,800,000
Direct Finance Leases B |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings on lines of credit |  | 0 | 899,000 |  |  |
Maximum borrowing capacity |  |  |  |  |  | 3,000,000
John's Creek |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings on lines of credit |  | 0 | 12,500,000 |  |  |
Maximum borrowing capacity |  |  |  |  | $ 25,000,000 | $ 8,000,000
Stated interest rate |  |  |  | 4.00% |  |
Johns' Creek, Carrollton, Allen |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings on lines of credit |  | $ 13,960,000 | $ 0 |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  |  |  |  |
BorrowingBaseLimitationTotalValueOfland | 50.00% |  |  |  |  |
BorrowingBaseLimitationTotalValueOfLotsOwned | 60.00% |  |  |  |  |
MaximumValueOfLandUsedWhenCalculatingBorrowingBase | 50.00% |  |  |  |  |
Minimum rate on Inwood loan | Direct Finance Leases A |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.00%
Minimum rate on Inwood loan | Direct Finance Leases B |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.00%
Other Assets | Johns' Creek, Carrollton, Allen |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt issuance cost | $ 400,000 |  |  |  |  |
Minimum | Johns' Creek, Carrollton, Allen |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |  |
Maximum | Johns' Creek, Carrollton, Allen |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Stated interest rate | 18.00% |  |  |  |  |

X
- Definition The revolving credit facility is subject to a borrowing base limitation equal to (1) this percentage times the total value of lots owned, plus (2) a percentage of the total value of land owned by certain of the Company's subsidiaries. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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