Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-Based Compensation (Narrative) (Details)

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Share-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
Cerberus Funds [Member]
years
Jun. 30, 2005
Cerberus Funds [Member]
Dec. 31, 2011
NV Equity Plan [Member]
Dec. 31, 2011
Stock Options [Member]
years
Dec. 31, 2010
Stock Options [Member]
Dec. 31, 2009
Stock Options [Member]
Dec. 31, 2008
Stock Options [Member]
Dec. 31, 2011
Restricted Share Units [Member]
Dec. 31, 2011
Key Employees [Member]
NV Equity Plan [Member]
Dec. 31, 2011
Former Employees [Member]
NV Equity Plan [Member]
Dec. 31, 2011
Former Non-Executive Directors [Member]
NV Equity Plan [Member]
Dec. 31, 2011
May 31,2014 [Member]
Restricted Share Units [Member]
Dec. 31, 2011
March 31, 2015 [Member]
Restricted Share Units [Member]
Dec. 31, 2011
May 31, 2013 [Member]
Restricted Share Units [Member]
Dec. 31, 2011
February 28, 2015 [Member]
Restricted Share Units [Member]
Dec. 31, 2011
May 31, 2015 [Member]
Restricted Share Units [Member]
Dec. 31, 2011
2012 [Member]
Restricted Stock [Member]
Dec. 31, 2011
2013 [Member]
Restricted Stock [Member]
Dec. 31, 2011
2014 [Member]
Restricted Stock [Member]
Dec. 31, 2011
2015 [Member]
Restricted Stock [Member]
Dec. 31, 2011
Maximum [Member]
NV Equity Plan [Member]
Dec. 31, 2011
Minimum [Member]
NV Equity Plan [Member]
Dec. 31, 2011
Minimum [Member]
Key Employees [Member]
Dec. 31, 2011
Minimum [Member]
Key Employees [Member]
NV Equity Plan [Member]
Share-Based Compensation [Line Items]                                                        
Exchange right, exercisable period         3                                              
Exchange right, extended exercisable period         2                                              
Exchange right, expiration date         November 27, 2013                                              
Ownership percentage           100.00%                                         10.00%  
Equity awards available for grants             4,251,848                                          
Award vesting period, in years             10 years           5 years                              
Percentage of stock option price per share, options granted                                                   100.00%   110.00%
Aggregate fair market value of stock options exercised                                                 $ 100,000,000      
Stock options outstanding, shares 2,057,203 2,283,541 2,575,000 2,887,500                   2,012,254 44,949                          
Stock options outstanding, weighted average remaining contractual term, years               6.1                                        
Stock options issued, weighted average grant date fair value                     $ 1.52                                  
Total stock-based compensation 6,236,000 3,402,000 [1],[2] 3,910,000         1,431,000 2,339,000 3,563,000                                    
Expected recognition of share-based compensation                                         $ 5,600,000 $ 5,200,000 $ 4,800,000 $ 1,700,000        
Restricted share units, expected to vest                               100,000 435,000 200,000 100,000 925,000                
Expected date of vesting                               May 31, 2014 March 31, 2015 May 31, 2013 February 28, 2015 May 31, 2015                
Restricted share units outstanding 745,965 745,965 2,211,360 2,457,098               1,760,000                                
[1] Includes the results of Genesis for the period from March 25, 2010 (date of acquisition) to December 31, 2010 and the issue of shares to Genesis and Waha.
[2] The Amalgamation gain, net of transaction expenses of $274, as presented in the consolidated income statement, consists of the Amalgamation gain of $31,023, as presented in the consolidated statement of cash flow and transaction expenses of $30,749 (Note 1).