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Summary of Significant Accounting Policies - Textual (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) state | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of states in which Entity operates | state | 36 |  |
Collection success rate of denied payments (percent) | 70.00% |  |
Minimum accrual of loss contingency needed to accrue for related legal fees | $ 5.0 |  |
Advertising expense | $ 6.3 | $ 7.5 | $ 7.3
Payor Source [Member] | Sales Revenue, Net [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Percentage of Medicare patient discharges (percent) | 100.00% | 100.00% | 100.00%
Payor Source [Member] | Sales Revenue, Net [Member] | Medicare [Member] | RAC Audits [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Percentage of Medicare patient discharges (percent) | 1.00% |  |
Accounting Standards Update 2016-09 [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 8.8 |  |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  | $ 17.3 |
Payments Related to Tax Withholding for Share-based Compensation |  | $ 11.6 | $ 17.2

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