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Restricted Net Assets - Additional Information (Detail) ¥ in Billions, $ in Billions | Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Stockholders' Equity Note [Abstract] |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs | ¥ 49.5 | $ 7.0 | ¥ 40.8

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- Definition Amount of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs as of the end of the most recently completed fiscal year. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration