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Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Cash and cash equivalents $ 99,591 $ 97,649  
Accounts receivable, net 362,666 322,439  
Other current assets 241,218 86,037  
Total current assets 703,475 506,125  
Property and equipment, net 2,145,599 1,952,045  
Goodwill 2,225,962 2,222,805 $ 2,199,937
Intangible assets, net 73,811 76,041  
Operating lease right-of-use assets 122,090 135,238  
Total assets 5,346,218 4,987,901  
Accounts payable 149,874 104,723  
Accrued salaries and benefits 122,264 125,298  
Current portion of operating lease liabilities 26,242 26,463  
Other accrued liabilities 539,947 110,592  
Total current liabilities 864,890 388,326  
Operating lease liabilities 104,873 116,429  
Other liabilities 145,907 125,033  
Total liabilities 2,536,074 2,086,917  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Cash and cash equivalents 50,531 32,478  
Accounts receivable, net 28,643 23,789  
Other current assets 2,757 2,561  
Total current assets 81,931 58,828  
Property and equipment, net 387,159 313,358  
Goodwill 42,384 39,564  
Intangible assets, net 18,263 16,139  
Operating lease right-of-use assets 6,034 6,284  
Total assets 535,771 434,173  
Accounts payable 6,419 4,650  
Accrued salaries and benefits 6,531 6,866  
Current portion of operating lease liabilities 263 233  
Other accrued liabilities 6,044 6,179  
Total current liabilities 19,257 17,928  
Operating lease liabilities 6,232 6,433  
Total liabilities $ 25,489 $ 24,361