v3.2.0.727
Equity Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Number of units        
Total awarded and unvested at the beginning of the period (in shares)     2,381,440  
Granted (in shares)     12,057  
Forfeited (in shares)     (48,360)  
Total awarded and unvested at the end of the period (in shares) 2,345,137   2,345,137  
Weighted average grant date fair value        
Total awarded and unvested at the beginning of the period (in dollars per unit)     $ 29.00  
Granted (in dollars per unit)     24.88  
Forfeited (in dollars per unit)     29.00  
Total awarded and unvested at the end of the period (in dollars per unit) $ 28.98   $ 28.98  
Aggregate intrinsic value        
Total awarded and unvested at the beginning of the period     $ 65,490  
Total awarded and unvested at the end of the period $ 67,165   67,165  
Additional disclosures        
Allocated Share-based Compensation Expense 5,400 $ 2,500 $ 10,000 $ 3,800
Weighted average period for recognizing unrecognized stock-based compensation expense     3 years 3 months 18 days  
Antero        
Additional disclosures        
Unamortized expense $ 57,000   $ 57,000  
Weighted average period for recognizing unrecognized stock-based compensation expense     3 years 3 months 18 days  
Midstream LTIP        
Additional disclosures        
Number of stock-based compensation awards authorized 10,000,000   10,000,000  
Number of shares available for future grant under the Plan 7,654,863   7,654,863  
Various equity based compensation plans | Antero        
Additional disclosures        
Unamortized expense $ 197,000   $ 197,000