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Variable Interest Entities - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) Facility	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Consolidated assets	$ 4,594,727	$ 6,499,362
Consolidated liabilities	$ 2,098,207	4,544,591
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of facilities operated through non-wholly owned subsidiaries | Facility	6
Consolidated assets	$ 298,924	261,657
Consolidated liabilities	$ 24,430	$ 26,059
Variable Interest Entity, Primary Beneficiary [Member] | Minimum [Member]
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	60.00%
Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	86.00%

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