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Segment Reporting - Revenues and Percentage of Consolidated Revenues (Parenthetical) (Detail) (Maximum [Member], BP PLC [Member], Sales Revenue, Net [Member]) | 12 Months Ended
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Dec. 31, 2013
Maximum [Member] | BP PLC [Member] | Sales Revenue, Net [Member] |
Segment Reporting Information [Line Items] |
Percentage of revenue for BP PLC | 10.00%

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