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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, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Entity Wide Revenue Major Customer [Line Items] | ||||||||||
| Percentage of receipts | 10.00% | |||||||||
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ConocoPhillips
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| Entity Wide Revenue Major Customer [Line Items] | ||||||||||
| Percentage of receipts | [1],[2] | 16.00% | [1] | 16.00% | [1] | |||||
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ConocoPhillips | Companies Separated Into Two
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| Entity Wide Revenue Major Customer [Line Items] | ||||||||||
| Percentage of receipts | 8.00% | |||||||||
| Number of companies separated | 2 | |||||||||
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| X | ||||||||||
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- Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number Of Companies Separated No definition available.
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