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Bonds Payable - Major Terms of Overseas Unsecured Bonds (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Overseas [member] | Issuance period one [Member]  
Bonds payable [line items]  
Overseas unsecured bonds $ 1,000.0
Overseas [member] | Issuance period two [Member]  
Bonds payable [line items]  
Overseas unsecured bonds 750.0
Overseas [member] | Issuance period three [Member]  
Bonds payable [line items]  
Overseas unsecured bonds $ 1,250.0
Overseas unsecured bonds [member] | Issuance period one [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2025-09
Coupon Rate 0.75%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance period two [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2027-09
Coupon Rate 1.00%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
Overseas unsecured bonds [member] | Issuance period three [Member]  
Bonds payable [line items]  
Issuance starting period 2020-09
Issuance ending period 2030-09
Coupon Rate 1.375%
Repayment and Interest Payment Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually