Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (Angola, USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Nov. 30, 2006
Well
Mar. 31, 2014
acre
Well
Angola
   
Commitments And Contingencies Textual Abstract    
Number of exploration wells 2  
Area under acquire property exploration rights agreement term   1,400,000
Number of exploration wells drilling required to pay remaining obligation   2
Joint operation agreement related to third party in working interest percentage   40.00%
Additional joint operation agreement related to third party in working interest percentage   10.00%
Production license agreement term 4 years  
Production license agreement term extended by government 3 years  
Well penalty, minimum   $ 5.0
Well penalty, maximum   10.0
Recorded restricted cash   10.0
Asset retirement obligation   $ 11.6