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Debt - Subsequent Event - 2017 Credit Agreement (Details)
 6 Months Ended 12 Months Ended
Jul. 19, 2017
USD ($)
Jan. 19, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
Jul. 18, 2017
Line of Credit Facility [Line Items]              
Repayment of revolving line of credit     $ 29,000,000 $ 3,000,000      
Revolving Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity   $ 200,000,000.0          
Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Borrowing capacity $ 100,000,000.0            
Line of credit facility, sub-limit $ 50,000,000.0            
Interest coverage ratio 2.00            
Subsequent Event | 2017 Term Facility              
Line of Credit Facility [Line Items]              
Effective interest rate             4.08%
Leverage Tranche One | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Net leverage ratio 5.50            
Leverage Tranche Two | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Net leverage ratio 5.00            
Leverage Tranche Three | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Net leverage ratio 4.25            
Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Net leverage ratio 5.00            
Retroactive increase (as a percent) 0.25%            
Net revenue variance (as a percent) 15.00%            
2017 Credit Agreement | Subsequent Event              
Line of Credit Facility [Line Items]              
Fee amount         $ 16,800,000    
Repayment of revolving line of credit         897,500,000    
Loss on extinguishment of debt         $ (29,400,000)    
LIBOR | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Interest rate (as a percent) 1.00%            
Variable rate basis spread (as a percent) 4.50%            
LIBOR | Revolving Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Interest rate (as a percent) 1.00%            
Variable rate basis spread (as a percent) 4.50%            
Base Rate | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Interest rate (as a percent) 2.00%            
Variable rate basis spread (as a percent) 3.50%            
Base Rate | Revolving Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Interest rate (as a percent) 2.00%            
Variable rate basis spread (as a percent) 3.50%            
Less Than or Equal To 5.00 | LIBOR | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent) 5.75%            
Less Than or Equal To 5.00 | Base Rate | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent) 4.75%            
Greater Than 5.00 | LIBOR | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent) 6.75%            
Greater Than 5.00 | Base Rate | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent) 5.75%            
Prepaid with Proceeds of Repricing Transaction | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Prepayment fee percentage 1.00%            
Voluntary Prepayments Through One-Year Anniversary of Initial Period End Date | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Prepayment fee percentage 2.00%            
Voluntary Prepayments After One-Year Anniversary of Initial Period End Date | Term Loans | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Prepayment fee percentage 1.00%            
Minimum | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Effective interest rate           5.74%  
Maximum | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Effective interest rate           5.76%  
Goldman Sachs Bank USA | 2017 Term Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity   900,000,000          
Goldman Sachs Bank USA | Subsequent Event | First Amendment to 2017 Credit Agreement              
Line of Credit Facility [Line Items]              
Line of Credit, Collateral Fees Percentage 0.25%            
Goldman Sachs Bank USA | 2017 Credit Agreement | Revolving Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity   200,000,000          
Goldman Sachs Bank USA | 2017 Credit Agreement | 2017 Term Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity   $ 900,000,000          
Goldman Sachs Bank USA | LIBOR | 2017 Credit Agreement | Revolving Facility              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent)   2.50%          
Goldman Sachs Bank USA | LIBOR | 2017 Credit Agreement | 2017 Term Facility              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent)   2.75%          
Goldman Sachs Bank USA | Base Rate | 2017 Credit Agreement | Revolving Facility              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent)   1.50%          
Goldman Sachs Bank USA | Base Rate | 2017 Credit Agreement | 2017 Term Facility              
Line of Credit Facility [Line Items]              
Variable rate basis spread (as a percent)   1.75%