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Variable Interest Entities - Schedule of Consolidated VIEs Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Cash and cash equivalents $ 185,546 $ 378,697
Accounts receivable, net 286,522 273,551
Other current assets 103,558 61,332
Total current assets 575,626 2,523,395
Property and equipment, net 1,651,274 1,622,896
Goodwill 2,103,503 2,105,264
Intangible assets, net 68,463 68,535
Operating lease right-of-use assets 101,691 96,937
Total assets 4,564,001 6,499,362
Accounts payable 87,223 87,815
Accrued salaries and benefits 133,590 124,912
Current portion of operating lease liabilities 19,254 18,916
Other accrued liabilities 171,867 178,453
Total current liabilities 425,215 1,308,185
Operating lease liabilities 89,107 84,029
Other liabilities 118,363 133,412
Total liabilities 2,149,021 4,544,591
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Cash and cash equivalents 20,983 15,151
Accounts receivable, net 24,384 18,507
Other current assets 1,228 1,461
Total current assets 46,595 35,119
Property and equipment, net 183,537 175,103
Goodwill 34,945 34,945
Intangible assets, net 9,581 9,581
Operating lease right-of-use assets 6,758 6,909
Total assets 281,416 261,657
Accounts payable 3,285 4,143
Accrued salaries and benefits 4,509 4,357
Current portion of operating lease liabilities 180 164
Other accrued liabilities 9,433 8,366
Total current liabilities 17,407 17,030
Operating lease liabilities 6,769 6,863
Other liabilities 2,166 2,166
Total liabilities $ 26,342 $ 26,059