XML 29 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements - Assumptions for Determining Fair Value of Derivatives Using Monte Carlo Simulation (Detail) (Discovery Offshore, Warrants, NOK)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Discovery Offshore | Warrants
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Strike Price (NOK) 11.50 11.50
Target Price (NOK) 23.00 23.00
Stock Value (NOK) 13.80 13.00
Expected Volatility (%) 50.00% 50.00%
Risk-Free Interest Rate (%) 1.24% 1.44%
Expected Life of Warrants (5 years at inception) 2 years 11 months 9 days 3 years 1 month 6 days
Number of Warrants 5,000,000 5,000,000