Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Years Subject to Examination by Major Tax Jurisdictions (Detail)

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Income Taxes - Income Tax Years Subject to Examination by Major Tax Jurisdictions (Detail)
 12 Months Ended
Dec. 31, 2013
United States
  
Income Tax years subject to examination by major tax jurisdictions  
Income tax examination year under examination range start   
Income tax examination year under examination range end   
Gabon
  
Income Tax years subject to examination by major tax jurisdictions  
Income tax examination year under examination range start   
Income tax examination year under examination range end