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Equity (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
HPU
  
Stock Performance Award Program [Line Items]  
Number of votes per share 0.25
High Performance Unit Program
  
Stock Performance Award Program [Line Items]  
Initial purchase price of high performance units 9.8
Number of plans which did not meet the required performance thresholds 4
High Performance Unit Program | Employee
  
Stock Performance Award Program [Line Items]  
Number of plans which have exceeded performance thresholds 3
High Performance Unit Program 2002 Plan | Employee | HPU
  
Stock Performance Award Program [Line Items]  
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid 819,254
Number of shares outstanding (in shares) 5,000
High Performance Unit Program 2003 Plan | Employee | HPU
  
Stock Performance Award Program [Line Items]  
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid 987,149
Number of shares outstanding (in shares) 5,000,000
High Performance Unit Program 2004 Plan | Employee | HPU
  
Stock Performance Award Program [Line Items]  
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid 1,031,875
Number of shares outstanding (in shares) 5,000,000