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Summary of Significant Accounting Policies - Summary of Movement of Non-Marketable Investments (Detail) - Non-marketable Investments [Member] - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Movement of Non-Marketable Investments [Line Items] |  |
Opening balance | ¥ 86,501 |
Purchase of non-marketable investments | 771,218 | ¥ 86,578
Disposal of non-marketable investments | (1,508) |
Fair value change |  | (77)
Ending balance | ¥ 856,211 | ¥ 86,501

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