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Segment Reporting - Revenues and Percentage of Consolidated Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | $ 1,830,085 | $ 1,980,771 | $ 1,976,022
BP PLC [Member] | Customer Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | 182,500 |  |
BP PLC [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of Revenue of Significant Customer | 10.00% |  |
Statoil ASA [Member] | Customer Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | 250,500 | 299,100 | 283,700
Statoil ASA [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of Revenue of Significant Customer | 14.00% | 15.00% | 14.00%
Petroleo Brasileiro SA [Member] | Customer Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue of Significant Customer | $ 244,300 | $ 289,300 | $ 224,900
Petroleo Brasileiro SA [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of Revenue of Significant Customer | 13.00% | 15.00% | 11.00%

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