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Percentage of Revenue by Major Customers (Parenthetical) (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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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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ConocoPhillips | Companies Separated Into Two
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| Revenue, Major Customer [Line Items] | ||||||||
| Percentage of receipts | 8.00% | |||||||
| Number of companies separated | 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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| X | ||||||||||
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- Definition
Number Of Companies Separated No definition available.
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