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Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Cash and cash equivalents $ 178,915 $ 378,697
Accounts receivable, net 276,041 273,551
Other current assets 73,269 61,332
Total current assets 528,225 2,523,395
Property and equipment, net 1,654,732 1,622,896
Goodwill 2,105,264 2,105,264
Intangible assets, net 68,627 68,535
Operating lease right-of-use assets 96,205 96,937
Total assets 4,526,915 6,499,362
Accounts payable 91,505 87,815
Accrued salaries and benefits 127,827 124,912
Current portion of operating lease liabilities 18,696 18,916
Other accrued liabilities 161,040 178,453
Total current liabilities 410,979 1,308,185
Operating lease liabilities 83,731 84,029
Other liabilities 124,616 133,412
Total liabilities 2,172,216 4,544,591
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Cash and cash equivalents 18,657 15,151
Accounts receivable, net 21,007 18,507
Other current assets 1,454 1,461
Total current assets 41,118 35,119
Property and equipment, net 177,449 175,103
Goodwill 34,945 34,945
Intangible assets, net 9,581 9,581
Operating lease right-of-use assets 6,834 6,909
Total assets 269,927 261,657
Accounts payable 3,427 4,143
Accrued salaries and benefits 5,024 4,357
Current portion of operating lease liabilities 172 164
Other accrued liabilities 8,561 8,366
Total current liabilities 17,184 17,030
Operating lease liabilities 6,819 6,863
Other liabilities 2,166 2,166
Total liabilities $ 26,169 $ 26,059