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Equity-Based Compensation - Parent Equity-Based Compensation Plan (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity-based compensation        
Equity-based compensation   $ 86,745 $ 8,034 $ 9,787
Equity-based compensation liability     19,423  
Parent Plan        
Equity-based compensation        
Equity-based compensation   70,400    
Equity-based compensation liability   0 $ 19,400  
Award Modification, Principal Forgiveness | Parent Plan        
Equity-based compensation        
Equity-based compensation   1,500    
Common Units | Performance-based Class A and Class C common units | Parent Plan        
Equity-based compensation        
Equity-based compensation   40,400    
Common Units | Cliff-vesting awards | Parent Plan        
Equity-based compensation        
Equity-based compensation   19,400    
Preferred, Class A and Class B Common Units | Award Modification, Preferred and Common Units Purchased with Loans | Parent Plan        
Equity-based compensation        
Equity-based compensation   $ 9,100    
PG Holdco, LLC | Common Units | Time-vesting conditions | Parent Plan        
Equity-based compensation        
Unvested common units converted upon dissolution 1,028,122