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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Income (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Disclosure Of Information On Income Statement [line items] |  |  |  |
Interest income | ¥ 166,970 | $ 25,801 | ¥ 177,261 | ¥ 147,244
Dividend income from quoted equity securities | 166 | 26 | 959 | 1,992
Gain on disposal of property, plant and equipment |  |  |  | 8,835
Gain on disposal of quoted equity securities | 874 | 135 | 11,528 |
Gain on disposal of right-of-use assets | 2,574 | 398 | 9,237 |
Government grants | 209,793 | 32,419 | 122,371 | 32,237
Fair value gain on quoted equity securities |  |  | 1,118 |
Fair value gain on foreign exchange forward contract | 999 | 154 |  | 4,529
Realised foreign exchange gain, net | 1,390 | 215 | 3,604 | 5,306
Unrealised foreign exchange gain, net | 1,827 | 282 | 4,679 | (4,235)
Others | 15,676 | 2,423 | 16,404 | 9,235
Other operating income | ¥ 400,269 | $ 61,853 | ¥ 347,161 | ¥ 205,143

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