Quarterly report pursuant to Section 13 or 15(d)

Capitalization of Exploratory Well Costs (Detail)

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Capitalization of Exploratory Well Costs (Detail)
$ in Millions
Jun. 30, 2015
USD ($)
Mutamba Iroru [Member] | Aging of Capitalized Exploratory Well Costs, Period Two [Member]  
Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [Line Items]  
Capitalized exploratory well costs that have been capitalized for a period greater than one year $ 9.2