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The CARES Act - Additional Information (Detail) - CARES Act [Member] - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 24, 2020 | Aug. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020
CARES Act [Line Items] |  |  |  |  |
Offer of eligible relief amount |  |  |  | $ 100,000,000,000 |
Additional offer of eligible relief amount | $ 75,000,000,000 |  |  |  |
Cash benefit relating to delay of payment of social security payroll taxes |  |  |  |  | $ 39,000,000
Interest expense deduction threshold percentage of adjusted taxable income |  |  |  |  | 50.00%
Net operating loss carryforwards and carrybacks offset percentage of taxable income |  |  |  |  | 100.00%
Net operating loss carried back period |  |  |  |  | 5 years
Reversal of income recorded under CARES Act |  |  | $ 18,100,000 |  |
Tax Year 2019 [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Received cash benefit in form of refunds |  |  |  |  | $ 14,000,000
Lower tax payments related to interest expense |  |  |  |  | 2,700,000
Tax Year 2020 [Member] | Minimum [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Lower tax payments related to interest expense |  |  |  |  | 15,000,000
Tax Year 2020 [Member] | Maximum [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Lower tax payments related to interest expense |  |  |  |  | $ 20,000,000
Medicare [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Percentage of increase in medicare reimbursement rate |  |  |  | 2.00% |
Public Health and Social Services Emergency Fund [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Receipt of CARES Act of 2020 aid amount |  |  |  | $ 19,700,000 |
Receipt of additional CARES Act of 2020 aid amount |  | $ 12,800,000 |  |  |
CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member] |  |  |  |  |
CARES Act [Line Items] |  |  |  |  |
Amount of advance payment received |  |  |  | $ 45,000,000 |

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