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Debt Instruments at Amortized Cost - Additional Information (Detail)
₱ in Millions, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 09, 2021
PHP (₱)
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
PHP (₱)
Dec. 31, 2020
PHP (₱)
Dec. 31, 2018
PHP (₱)
Dec. 31, 2019
PHP (₱)
Feb. 28, 2013
PHP (₱)
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments         ₱ 1,153.0   ₱ 150.0  
Seven Year GT Capital Bond [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments             150.0  
Retail Treasury Bond [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Gross coupon rate 2.375%              
Purchased retail treasury bond 3 years              
Face value of retail treasury bond ₱ 100.0              
Maturity on face value of retail treasury bond Mar. 09, 2024              
BDO Unibank, Inc. [Member] | 0.90% Two Year Time Deposit [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments | $     $ 10.0          
Time deposit maturity date     Jun. 29, 2022          
Gross coupon rate     0.90%          
Long term fixed rate time deposit interest period     30 days          
BDO Unibank, Inc. [Member] | 1.00% Two Year Time Deposit [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments | $   $ 10.0            
Time deposit maturity date   Jul. 02, 2022            
Gross coupon rate   1.00%            
Long term fixed rate time deposit interest period   30 days            
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments | $   $ 2.0            
Gross coupon rate   2.00%            
Long term fixed rate time deposit interest period   360 days            
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member] | Minimum [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Time deposit maturity date   Jul. 29, 2022            
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member] | Maximum [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Time deposit maturity date   Aug. 01, 2022            
Smart Communications, Inc. [Member] | Seven Year GT Capital Bond [Member]                
Disclosure of detailed information about financial instruments [Line Items]                
Investment in debt securities and other long-term investments             ₱ 150.0 ₱ 150.0
Gross coupon rate               4.84%
Interest income, net of withholding tax       ₱ 5.8 ₱ 1.0 ₱ 5.8