Quarterly report pursuant to Section 13 or 15(d)

Organization and Significant Accounting Principles - Additional Information (Detail)

v2.4.0.6
Organization and Significant Accounting Principles - Additional Information (Detail)
6 Months Ended
Jun. 30, 2012
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