Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended
	Apr. 21, 2020	Dec. 31, 2012	Apr. 01, 2011	Apr. 30, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Borrowings on revolving credit facility					$ 71,573
Subsequent Event [Member] | CARES Act [Member]
Subsequent Event [Line Items]
Offer of eligible relief amount				$ 100,000,000
Received relief amount				$ 20,000
Subsequent Event [Member] | CARES Act [Member] | CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member]
Subsequent Event [Line Items]
Period of amount payable in advance				3 months
Repayment of advanced payments description				The repayment of these accelerated/advanced payments does not begin until 120 days after the date of the issuance of the payment. Once the repayment period starts, the amounts previously advanced to the provider or supplier will be recouped from the provider’s or supplier’s new Medicare claims. Facilities will generally have 210 days from the date the accelerated or advance payment was made to repay the amounts that they owe. The Company applied for and received approximately $45 million in April 2020 from this program, which the Company expects to repay over a three-month period from August to November 2020.
Amount of advance payment received				$ 45,000
Expected repayment period				3 months
Subsequent Event [Member] | CARES Act [Member] | CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member] | Maximum [Member]
Subsequent Event [Line Items]
Percentage of amount payable in advance				100.00%
Amended and Restated Senior Credit Facility [Member]
Subsequent Event [Line Items]
Date entered into an agreement		Dec. 31, 2012	Apr. 01, 2011
Amended and Restated Senior Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Borrowings on revolving credit facility				$ 100,000
Thirteenth Amendment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Date entered into an agreement	Apr. 21, 2020