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Segment Information and Major Customers - Segment Information by Major Customers (Detail) (Sales [Member]) | 12 Months Ended
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Dec. 31, 2013
Plains All American Inc., Oil Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 52.00%
Sunoco Inc., Oil Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 28.00%
Atlas Pipeline Mid-Continent, Gas Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 40.00%
Unimark LLC, Gas Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 13.00%

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