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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013 Entity
Houma, Louisiana
Significant Accounting Policies [Line Items]
Number of major subsidiaries	5
San Patricio County, Texas
Significant Accounting Policies [Line Items]
Number of major subsidiaries	1

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- Definition

Number of Subsidiaries

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