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Variable Interest Entities - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Facility
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]    
Consolidated assets $ 4,526,915 $ 6,499,362
Consolidated liabilities $ 2,172,216 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 $ 269,927 261,657
Consolidated liabilities $ 26,169 $ 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%