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Bonds Payable - Summary of Bonds Payable (Parenthetical) (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
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% |  |  |
Repayable at maturity in January 2024 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate | 1.45% |  |  |
US$400,000 thousand [member] | Cost [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional Amount | $ 400,000,000 |  |  |
US$200,000 thousand [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional Amount |  |  | $ 200,000,000 |
US$200,000 thousand [member] | Cost [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional Amount | 200,000,000 |  |  |
Secured Overseas Bonds One [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate |  | 2.125% |  | 2.125%
Notional Amount |  |  |  | $ 300,000,000
Secured Overseas Bonds One [member] | Cost [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional Amount | $ 300,000,000 |  |  |
Bonds repayment date | July 2017 |  |  |

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