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Percentage of Revenue by Major Customers (Detail)
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12 Months Ended | |||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Revenue, Major Customer [Line Items] | ||||||||||
| Percentage of receipts | 10.00% | |||||||||
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Shell Trading (US) Co.
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| Revenue, Major Customer [Line Items] | ||||||||||
| Percentage of receipts | 35.00% | 36.00% | 40.00% | |||||||
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ConocoPhillips
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| Revenue, Major Customer [Line Items] | ||||||||||
| Percentage of receipts | 16.00% | [1] | 16.00% | [1] | 17.00% | [1] | ||||
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J.P. Morgan Ventures Energy Corp.
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| Revenue, Major Customer [Line Items] | ||||||||||
| Percentage of receipts | [2] | 10.00% | [2] | |||||||
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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