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Equity Compensation Plans (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 1 Months Ended 12 Months Ended
Aug. 31, 2007
AAP LP Class B Units
Dec. 31, 2011
AAP LP Class B Units
Dec. 31, 2010
AAP LP Class B Units
Jul. 31, 2010
Class B Units of PNGS GP LLC
Dec. 31, 2011
Class B Units of PNGS GP LLC
Share-based Compensation Arrangement, by Share-based Payment Award          
Authorized grants (in units) 200,000     165,000  
Unit forfeitures (in units)         16,500
Units Outstanding (in units)         74,250
Reserved for Future Grants, outstanding   16,500 24,500   90,750
Increments (as a percent)       25.00%  
Increment period (in days)       180 days  
Annualized distribution level one (in dollars per unit)       $ 2.00  
Annualized distribution level two (in dollars per unit)       $ 2.30  
Annualized distribution level three (in dollars per unit)       $ 2.50  
Annualized distribution level four (in dollars per unit)       $ 2.70  
Annualized distribution, low end of range (in dollars per unit) $ 3.50        
Annualized distribution, high end of range (in dollars per unit) $ 4.80        
Number of days required for vesting, in some cases 180 days        
Award vesting rights (as a percent)       50.00%  
Award vesting rights on the fifth anniversary of the date of grant (as a percent)       50.00%  
Award vesting rights after the fifth anniversary of the date of grant (as a percent)       100.00%  
Threshold on distributions paid for participation in award $ 11.0     $ 2.5  
Maximum participation in excess of distribution (as a percent) 8.00%     6.00%