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Financial Information for the Company and Its Subsidiaries - Summarized Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]              
Current assets $ 575,626   $ 2,523,395        
Property and equipment, net 1,651,274   1,622,896        
Goodwill 2,103,503   2,105,264        
Current liabilities 425,215   1,308,185        
Long-term debt 1,443,192   2,968,948        
Redeemable noncontrolling interests 58,394   55,315        
Total equity 2,356,586 $ 2,297,999 1,899,456 $ 2,606,639 $ 2,503,338 $ 2,464,167 $ 2,505,381
Parent [Member]              
Condensed Financial Statements, Captions [Line Items]              
Current assets 509,468   654,735        
Property and equipment, net 1,442,435   1,421,875        
Goodwill 1,990,544   1,992,305        
Total noncurrent assets 3,645,734   3,640,809        
Current liabilities 403,943   626,419        
Long-term debt 1,416,191   2,786,125        
Total noncurrent liabilities 1,689,357   3,045,981        
Total equity $ 2,061,902   $ 623,144