Investment in Unconsolidated Affiliates - Summary of Financial Information (Details) - SG2 Holdings, North Star Holdings and Lost Hills Blackwell Holdings - USD ($) $ in Thousands	3 Months Ended	8 Months Ended	9 Months Ended
Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2015	Aug. 31, 2016
Summary statements of operations information:
Revenue	$ 24,433	$ 23,178	$ 40,497	$ 52,140
Operating expenses	11,201	12,102	25,480	34,483
Net income	$ 13,346	$ 11,155	$ 15,025	$ 17,964

The amount of the cost of sales reported by an equity method investment of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The amount of net income (loss) reported by an equity method investment of the entity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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