The CARES Act - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Apr. 24, 2020	Mar. 31, 2023	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CARES Act [Line Items]
Income from relief fund						$ 32.8
Expected repay of payroll tax deferrals			$ 39.3
CARES Act [Member]
CARES Act [Line Items]
Offer of eligible relief amount		$ 100,000.0
Additional offer of eligible relief amount	$ 75,000.0
Cash benefit relating to delay of payment of social security payroll taxes		39.3
Remaining unrecognized provider relief funds		$ 9.0		$ 9.0
CARES Act [Member] | Medicare [Member]
CARES Act [Line Items]
Repayment of advanced payments					$ 25.1
Percentage of increase in medicare reimbursement rate						2.00%
Percentage of reduced in medicare reimbursement rate		1.00%
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member]
CARES Act [Line Items]
Receipt of CARES Act of 2020 aid amount						$ 34.9
Income from relief fund				21.5	17.9
Receipt of additional CARES Act of 2020 aid amount				7.7	$ 24.2
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member] | American Rescue Plan
CARES Act [Line Items]
Receipt of additional CARES Act of 2020 aid amount				14.2
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member]
CARES Act [Line Items]
Repayment of advanced payments				$ 20.1
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member]
CARES Act [Line Items]
Amount of advance payment received						$ 45.2