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Investment in ARMA Energy . Inc - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member], Arma Energy, Inc. [Member], USD $) | 0 Months Ended |  |  | 0 Months Ended |
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Jun. 27, 2013 | Jun. 26, 2014 | Feb. 01, 2013 | Feb. 01, 2013 Promissory Note [Member] | Feb. 01, 2013 Promissory Note [Member]
Variable Interest Entity [Line Items] |  |  |  |  |
Preferred stock received |  |  | 71.00% |  |
Promissory note, Principal amount |  |  |  |  | $ 500,000
Promissory note, Maturity period |  |  |  | 5 years |
Ownership stock sale percentage | 58.00% |  |  |  |
Equity method investments |  | $ 0 |  |  |

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