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Basis of Accounting - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Basis Of Accounting [Line Items]      
Percentage of revenue recovered 75.50% 38.70%  
Bottom of Range [Member]      
Basis Of Accounting [Line Items]      
Percentage of voting equity interests 20.00%   20.00%
Top of Range [Member]      
Basis Of Accounting [Line Items]      
Proportion of voting rights held in investees     20.00%