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Subsequent Events - Additional Information (Detail) - Negotiable obligations [member] - USD ($)
$ in Millions
Feb. 11, 2021
Jan. 07, 2021
Feb. 26, 2021
Feb. 12, 2021
Dec. 31, 2020
Class XIV [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans     $ 75.6    
Class XIX [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans denominated in UVA     $ 60.5    
Debt Exchange [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Principal Maturity 2021        
Debt Exchange [Member] | Class XVI [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Percentage of outstanding capital stock   50.00%      
Percentage of outstanding loan principal   50.00%      
Debt Exchange [Member] | Class XLVII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Refinancing percentage 60.00%        
Debt Exchange [Member] | Bottom of range [member]          
Disclosure of non-adjusting events after reporting period [line items]          
Percentage of appreciation or depreciation on exchange rate   1.50%      
Debt Exchange [Member] | Bottom of range [member] | Class XLVII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Proportion of global exchange participation in loans 32.00%        
Debt Exchange [Member] | Top of range [member]          
Disclosure of non-adjusting events after reporting period [line items]          
Percentage of appreciation or depreciation on exchange rate   9.00%      
Debt Exchange [Member] | Top of range [member] | Class XLVII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Proportion of global exchange participation in loans 59.80%        
Major Issuance Of Negotiable Obligations [Member] | Class XVI [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       $ 775.8  
Major Issuance Of Negotiable Obligations [Member] | Class XVIII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       747.8 $ 575.6
Major Issuance Of Negotiable Obligations [Member] | Class XIV [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Interest rate     2.00%    
Major Issuance Of Negotiable Obligations [Member] | Class XIX [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Interest rate     3.50%    
Major Debt Swap [Member] | Class XLVII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       247.3  
Major Debt Swap [Member] | Class XVIII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       656.4  
Major Debt Swap [Member] | Class XIII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       201.7  
Major Debt Swap [Member] | Class XXXIX [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       368.2  
Major Debt Swap [Member] | Class LIII [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       190.7  
Major Debt Swap [Member] | Class I [Member]v          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       101.0  
Major Debt Swap [Member] | Class LIV [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans       $ 213.4  
Debt Exchange authorized payment by BCRA [Member]          
Disclosure of non-adjusting events after reporting period [line items]          
Loans $ 9.0