General - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Mar. 31, 2021
Disclosure of General Information [Line Items]
Additional funds received from government by CARES Act			$ 189
Return of funds by CARES Act to government		$ 189
Medicare Accelerated and Advance Payment Program
Disclosure of General Information [Line Items]
Medicare accelerated payments received	$ 695