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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, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Profit or loss [Abstract] |  |  |  |
Interest income | ¥ 105,421 | $ 16,656 | ¥ 56,983 | ¥ 41,314
Dividend income from held for trading investment | 2,532 | 400 | 943 |
Gain on disposal of subsidiaries (Note 4) | 216,115 | 34,145 |  |
Gain on disposal of joint venture (Note 22) | 107,976 | 17,059 |  |
Gain on disposal of associate | 199 | 31 |  |
Gain on disposal of property, plant and equipment | 11,668 | 1,843 |  |
Gain on disposal of intangible assets | 115,235 | 18,206 |  |
Gain on disposal of prepaid operating leases |  |  |  | 2,511
Gain on liquidation of joint venture |  |  |  | 348
Government grants | 34,337 | 5,425 | 41,515 | 31,205
Fair value gain on held for trading investment | 12,768 | 2,017 |  |
Fair value gain on foreign exchange forward contract (Note 19) |  |  |  | 15,506
Write-back of trade and other payables | 29 | 5 |  | 9
Write-back of allowance for anticipated losses on development properties |  |  |  | 2,976
Bad debt recovered |  |  |  | 4,257
Foreign exchange gain, net | 30,943 | 4,889 |  |
Others | 10,129 | 1,600 | 18,513 | 8,805
Other operating income | ¥ 647,352 | $ 102,276 | ¥ 117,954 | ¥ 106,931

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