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Subsequent Events (Details)	Apr. 13, 2018 USD ($) employee Facility	Mar. 31, 2018 employee
Subsequent Event [Line Items]
Entity number of employees | employee		1,500
Cedar Creek | Subsequent Event
Subsequent Event [Line Items]
Entity number of facilities | Facility	70
Entity number of employees | employee	2,600
Aggregate purchase price	$ 413,000,000.0
Business acquisition, consideration transferred, cash payments	345,000,000.0
Business acquisition, consideration transferred, liabilities incurred	68,000,000.0
Cedar Creek | Subsequent Event | Line of Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	600,000,000.0
Line of credit facility, additional borrowing capacity	265,000,000.0
Line of credit facility, additional borrowing capacity under uncommitted accordion feature	150,000,000.0
Cedar Creek | Subsequent Event | Secured Debt | Term Loan
Subsequent Event [Line Items]
Proceeds from term loan issuance	180,000,000.0
Quarterly term loan principal payments	$ 450,000

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