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Financial Assets and Financial Liabilities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |  |
Dividends received | $ 109,000 | $ 105,000 | $ 100,000
Maximum borrowing capacity | 287,017,000 | $ 275,334,000 |
Unused portion of the credit lines | $ 208,000,000 |  |
Liquidity discount | 30.00% | 30.00% |
Line Of Credit 1 [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | $ 207,928,000 | $ 182,361,000 |
Letters of Credit [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | 113,255,000 | 92,256,000 |
Open letters of credit [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Unused portion of the credit lines | 15,209,000 | 22,426,000 |
Foreign currency forward contracts [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Outstanding forward contracts, notional amount | $ (900,000) | $ (9,400,000) |

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