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Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Cash and cash equivalents $ 133,813 $ 378,697  
Accounts receivable, net 281,332 273,551  
Other current assets 79,886 61,332  
Total current assets 495,031 2,523,395  
Property and equipment, net 1,771,159 1,622,896  
Goodwill 2,199,937 2,105,264 $ 2,085,104
Intangible assets, net 70,145 68,535  
Operating lease right-of-use assets 133,761 96,937  
Total assets 4,768,078 6,499,362  
Accounts payable 98,575 87,815  
Accrued salaries and benefits 137,845 124,912  
Current portion of operating lease liabilities 23,348 18,916  
Other accrued liabilities 126,499 178,453  
Total current liabilities 404,861 1,308,185  
Operating lease liabilities 116,841 84,029  
Other liabilities 110,505 133,412  
Total liabilities 2,185,201 4,544,591  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Cash and cash equivalents 26,360 15,151  
Accounts receivable, net 20,144 18,507  
Other current assets 1,304 1,461  
Total current assets 47,808 35,119  
Property and equipment, net 220,793 175,103  
Goodwill 34,945 34,945  
Intangible assets, net 10,490 9,581  
Operating lease right-of-use assets 6,603 6,909  
Total assets 320,639 261,657  
Accounts payable 3,690 4,143  
Accrued salaries and benefits 5,656 4,357  
Current portion of operating lease liabilities 197 164  
Other accrued liabilities 6,818 8,366  
Total current liabilities 16,361 17,030  
Operating lease liabilities 6,666 6,863  
Other liabilities 1,083 2,166  
Total liabilities $ 24,110 $ 26,059