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Summary of Significant Accounting Policies (Details)	Apr. 13, 2018 USD ($) employee	Jun. 30, 2018 USD ($) employee Facility	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Entity number of facilities | Facility		70
Entity number of employees | employee		2,500
Cedar Creek
Debt Instrument [Line Items]
Entity number of employees | employee	1,100
Aggregate purchase price	$ 361,752,000
Business acquisition, consideration transferred, cash payments	166,447,000
Business acquisition, consideration transferred, liabilities incurred	13,743,000
Business acquisition, repayments of debt	174,213,000
Business acquisition, transaction costs	7,300,000
Cedar Creek | Secured Debt | Term Loan
Debt Instrument [Line Items]
Proceeds from term loan issuance	180,000,000.0
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 750,000,000	$ 335,000,000
Revolving Credit Facility | Cedar Creek | Line of Credit
Debt Instrument [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

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