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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% |  |  |  |  |

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