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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, 2015
Plains All American Inc., Oil Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 43.55%
Sunoco Inc., Oil Purchasers [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 24.92%
Targa Pipeline Mid-Continent [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 23.27%
Primexx Energy Corporation [Member] |
Revenue, Major Customer [Line Items] |
Revenue by major customers | 10.90%

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