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The CARES Act - Additional Information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 24, 2020 | Apr. 30, 2021 | Aug. 31, 2020 | Apr. 30, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
CARES Act [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Received benefit in form of refunds and lower future tax payments |  |  |  |  |  |  |  |  |  |  |  | $ 51,600 | $ 51,600 |
Received benefit related to interest expense |  |  |  |  |  |  |  |  |  |  |  | 22,800 | 22,800 |
Received benefit related to qualified improvement property legislation |  |  |  |  |  |  |  |  |  |  |  | 20,500 | 20,500 |
Expected permanent cash benefit due to loss |  |  |  |  |  |  |  |  |  |  |  | $ 8,300 | $ 8,300 |
Effective income tax rate reconciliation at federal statutory income tax rate |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  | 35.00%
Expected repay of payroll tax deferrals |  |  |  |  | $ 39,000 |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 18,070 |  |  |  |  |  |
CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offer of eligible relief amount |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |
Additional offer of eligible relief amount | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards and carrybacks offset percentage of taxable income |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Net operating loss carried back period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Cash benefit relating to delay of payment of social security payroll taxes |  |  |  |  |  |  |  |  |  |  |  | $ 39,000 |  |
CARES Act [Member] | Medicare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of advanced payments |  |  |  |  | $ 10,000 | $ 7,000 |  |  |  |  |  |  |  |
Percentage of increase in medicare reimbursement rate |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
Repayment of advanced payments period |  |  |  | 2022-09 |  |  |  |  |  |  |  |  |  |
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receipt of CARES Act of 2020 aid amount |  |  |  |  |  |  |  |  | $ 19,700 |  | $ 34,900 |  |  |
Receipt of additional CARES Act of 2020 aid amount |  | $ 24,200 | $ 12,800 |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  | $ 32,800 |  | 18,100 |  |  |  |  |
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of advance payment received |  |  |  |  |  |  |  |  | $ 45,000 |  |  |  |  |

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