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Cash Flow Information - Summary of Investing Activities with Partial Cash Payments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Investing Activities With Partial Cash Payments [Line Items] |  |  |
Cash paid during the year | $ 14,537 | $ 5,442 | $ 4,441
Purchase of PPE [Member] |  |  |
Disclosure Of Investing Activities With Partial Cash Payments [Line Items] |  |  |
Acquisition of property, plant and equipment | 16,696 | 3,406 |
Add: Payable for PPE or CIP - Opening | 355 | 213 |
Less: Payable for PPE or CIP - Ending | (196) | (355) |
Less: Prepayment for PPE & CIP - Opening | (2,388) | (210) |
Add: Prepayment for PPE & CIP - Ending | 70 | 2,388 |
Cash paid during the year | 14,537 | $ 5,442 |
Investment Properties [Member] |  |  |
Disclosure Of Investing Activities With Partial Cash Payments [Line Items] |  |  |
Acquisition of investment properties | 5,197 |  |
Less: acquisition by assuming directly related liabilities | (3,375) |  |
Less: noncash other operating income | (60) |  |
Cash paid during the year | $ 1,762 |  |

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