v2.4.0.8
Risk Concentration (Details)
12 Months Ended
Dec. 31, 2013
item
Interest rate risk  
Maturity period of debt for exposure to changes in market interest rates, minimum 1 year
Labor Agreements  
Number of employees 15,100
Number of employees engaged through contract labor providers 1,000
Number of persons working under operating agreements with Shelf Drilling 800