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Segment Reporting - Revenues and Percentage of Consolidated Revenues (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Statoil ASA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | $ 299.1 | $ 283.7 | $ 330.4
Percentage of Revenue of Significant Customer | 15.00% | 15.00% | 16.00%
Petroleo Brasileiro SA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | 289.3 | 224.9 | 226.0
Percentage of Revenue of Significant Customer | 15.00% | 12.00% | 11.00%
BP PLC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer |  |  | $ 222.2
Percentage of Revenue of Significant Customer |  |  | 11.00%

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- Definition Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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. + References No definition available. + Details
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