v3.3.0.814
Equity-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Nov. 12, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of units                
Total awarded and unvested at the beginning of the period (in shares)       2,381,440        
Granted (in shares)       12,057     2,381,440  
Total awarded and unvested at the end of the period (in shares)   2,345,137   2,345,137   2,345,137 2,381,440  
Weighted average grant date fair value                
Total awarded and unvested at the beginning of the period (in dollars per unit)       $ 29.00 $ 29.00   $ 29.00  
Granted (in dollars per unit)       24.88     29.00  
Total awarded and unvested at the end of the period (in dollars per unit)   $ 28.98   $ 28.98   $ 28.98 $ 29.00 $ 29.00
Aggregate intrinsic value                
Total awarded and unvested at the beginning of the period       $ 65,490 $ 65,490   $ 65,490  
Total awarded and unvested at the end of the period   $ 67,165   67,165   $ 67,165 65,490 $ 65,490
Additional disclosures                
Allocated Share-based Compensation Expense   $ 6,597 $ 3,339 $ 12,376 $ 5,281      
Number of stock-based compensation awards authorized 10,000,000              
Unamortized expense             $ 66,700  
Weighted average period for recognizing unrecognized stock-based compensation expense             3 years 9 months 18 days  
Midstream LTIP                
Additional disclosures                
Number of stock-based compensation awards authorized   10,000,000   10,000,000   10,000,000 10,000,000  
Number of shares available for future grant under the Plan   7,654,863   7,654,863   7,654,863 7,618,560  
Phantom share units                
Number of units                
Granted (in shares) 2,361,440         12,057    
Restricted stock awards                
Number of units                
Granted (in shares) 20,000              
Antero                
Additional disclosures                
Allocated Share-based Compensation Expense             $ 11,600 $ 24,300
Unamortized equity-based compensation expense             $ 208,500