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Organization and Significant Accounting Principles - Additional Information (Detail)
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6 Months Ended |
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Jun. 30, 2012
Entity
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Houma, Louisiana
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| Significant Accounting Policies [Line Items] | |
| Number of major subsidiaries | 5 |
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San Patricio County, Texas
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| Significant Accounting Policies [Line Items] | |
| Number of major subsidiaries | 1 |