Summary of Significant Accounting Policies - Additional Information (Detail)	4 Months Ended	12 Months Ended
	Apr. 30, 2020	Dec. 31, 2021 USD ($) group separate_payment state adjustment periodicRate	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) state
Summary Of Significant Accounting Policies [Line Items]
Medicare sequestration reduction adjustment	2.00%
Number of days from date RAP paid to submit final medicare bill		30 days
Number of medicare home health resource groups | group		432
Number of medicare clinical groups | group		12
Number of retroactive adjustments | adjustment		3
Selected hospice, periodic rates used to calculate revenue | periodicRate		1
Number of hospice, periodic rates used to calculate revenue | periodicRate		4
Number of separate payment rates | separate_payment		2
Percentage subject to inpatient cap		20.00%
Determination period for hospice Medicare inpatient reimbursement cap		12 months
Net service revenue		$ 2,219,622,000	$ 2,063,204,000	$ 2,080,241,000
Workers' compensation, maximum coverage per incident		1,000,000
Maximum coverage per incident		500,000
Goodwill impairment loss		0	0	0
Disposal related to goodwill associated with closure of underperforming locations		20,000.00	500,000	600,000
Loss on impairment of intangible assets		0	0	0
Impairment of long-lived assets		900,000	700,000	7,100,000
Disposal related to intangible assets		$ 900,000	700,000	$ 7,100,000
Number of states with Medicare provider enrollments | state		4		4
Amortization expense		$ 1,500,000	1,200,000	$ 1,300,000
Depreciation expense		19,400,000	20,000,000	17,000,000
Interest costs capitalized		$ 1,000,000	1,100,000
Redeemable noncontrolling interests were identified as mandatorily redeemable interests		0
General liability
Summary Of Significant Accounting Policies [Line Items]
Deductibles		$ 300,000
D&O coverage
Summary Of Significant Accounting Policies [Line Items]
Deductibles		$ 2,500,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Intangible asset estimated useful life		4 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Intangible asset estimated useful life		16 years
Buildings
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives		39 years
Transportation Equipment, Furniture and Other Equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives		3 years
Transportation Equipment, Furniture and Other Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives		15 years
Acquired Assets
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets		$ 0	0	0
HCI
Summary Of Significant Accounting Policies [Line Items]
Net service revenue		35,203,000	32,457,000	29,662,000
Accountable Care Organizations | HCI
Summary Of Significant Accounting Policies [Line Items]
Net service revenue		$ 12,100,000	9,600,000	$ 2,900,000
Changes in Moratorium Regulations
Summary Of Significant Accounting Policies [Line Items]
Disposal related to intangible assets			6,100,000
Underperforming Locations
Summary Of Significant Accounting Policies [Line Items]
Disposal related to intangible assets			$ 1,000,000