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Financial Assets and Financial Liabilities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Financial Instruments [Line Items] |  |  |
Dividends received | $ 108,000 | $ 109,000 | $ 105,000
Maximum borrowing capacity | 264,162,000 | 287,017,000 |
Unused portion of the credit lines | 200,000,000 |  |
Interest-bearing loans and borrowings, current portion | $ 10,131,000 | $ 11,356,000 |
Liquidity discount | 30.00% | 30.00% |
Line Of Credit 1 [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | $ 200,340,000 | $ 207,928,000 |
Letters of Credit [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | 95,034,000 | 113,255,000 |
Open letters of credit [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | 18,077,000 | 15,209,000 |
Foreign currency forward contracts [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Outstanding forward contracts, notional amount | $ 0 | $ (900,000) |

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