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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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Amount of advance payment received under the CARES Act.

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CARES Act.

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Cash benefit relating to delay of payment of social security payroll taxes.

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Received relief amount from U.S. government for eligible healthcare providers under the CARES Act.

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Percentage of increase in medicare reimbursement rate.

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Reversal of income recorded under CARES Act.

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The U.S. government offer of relief to eligible healthcare providers as part of the CARES Act.

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