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Reserves - Summary of Other Components of Equity (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Disclosure of other components of equity [line items] |  |  |
Other components of equity | ¥ (161,359) | $ (24,935) | ¥ (105,422)
Foreign currency translation reserve [member] |  |  |
Disclosure of other components of equity [line items] |  |  |
Other components of equity | (89,925) | (13,896) | (36,091)
Performance shares reserves [member] |  |  |
Disclosure of other components of equity [line items] |  |  |
Other components of equity | 19,758 | 3,053 | 19,758
Premium paid for acquisition of non-controlling interests [member] |  |  |
Disclosure of other components of equity [line items] |  |  |
Other components of equity | (11,472) | (1,773) | (11,472)
Fair value reserve of financial assets at FVOCI |  |  |
Disclosure of other components of equity [line items] |  |  |
Other components of equity | ¥ (79,720) | $ (12,319) | ¥ (77,617)

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