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Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Cash and cash equivalents $ 196,313 $ 378,697
Accounts receivable, net 282,161 273,551
Other current assets 88,685 61,332
Total current assets 567,159 2,523,395
Property and equipment, net 1,665,025 1,622,896
Goodwill 2,103,503 2,105,264
Intangible assets, net 69,366 68,535
Operating lease right-of-use assets 103,162 96,937
Total assets 4,594,727 6,499,362
Accounts payable 85,924 87,815
Accrued salaries and benefits 124,164 124,912
Current portion of operating lease liabilities 20,062 18,916
Other accrued liabilities 157,204 178,453
Total current liabilities 403,292 1,308,185
Operating lease liabilities 89,952 84,029
Other liabilities 117,883 133,412
Total liabilities 2,098,207 4,544,591
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Cash and cash equivalents 25,028 15,151
Accounts receivable, net 20,673 18,507
Other current assets 2,029 1,461
Total current assets 47,730 35,119
Property and equipment, net 199,078 175,103
Goodwill 34,945 34,945
Intangible assets, net 10,490 9,581
Operating lease right-of-use assets 6,681 6,909
Total assets 298,924 261,657
Accounts payable 3,102 4,143
Accrued salaries and benefits 5,735 4,357
Current portion of operating lease liabilities 188 164
Other accrued liabilities 7,604 8,366
Total current liabilities 16,629 17,030
Operating lease liabilities 6,718 6,863
Other liabilities 1,083 2,166
Total liabilities $ 24,430 $ 26,059