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Bonds Payable - Summary of Bonds Payable (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Repayable at maturity in January 2021 [member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 1.30% 1.30%
Repayable at maturity in January 2023 [member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 1.50% 1.50%
Repayable at maturity in January 2022 [member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 1.25% 1.25%
Repayable at maturity in January 2024 [member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 1.45% 1.45%
Repayable at maturity in April 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 0.90% 0.90%
Repayable at maturity in April 2026 [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 1.03% 1.03%
Repayable at maturity in October 2022 [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 2.15% 2.15%
Notional Amount $ 200,000 $ 200,000
Repayable at maturity in October 2024 [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 2.50% 2.50%
Notional Amount $ 100,000 $ 100,000
Repayable at maturity in December 2020 [Member]    
Disclosure of detailed information about borrowings [line items]    
Interest rate 0.00%