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v3.20.1

Investments - Additional Information (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($) | Jan. 01, 2018 CNY (¥) | Jan. 01, 2018 USD ($)
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Investment income | ¥ 89,099 | $ 12,798 | ¥ 69,841 | ¥ 45,020 |  |  |
Held-to-maturity investments, long-term | 36,816 |  | 121,671 |  | $ 5,288 |  |
Other comprehensive income-change in fair value of available-for-sale investments | 4,306 |  | 9,314 |  |  |  |
Other comprehensive income-realized gains reclassified from other comprehensive income to "investment income" | 9,663 |  | 5,103 |  |  |  |
Amortized cost of the available-for-sale investments | ¥ 15,081 |  | 182,142 |  |  |  |
Accumulated other comprehensive (loss)/income |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Impact of ASU 2016-01 |  |  | 251,641 |  |  |  |
ASU 2016-01 |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Cumulative effect of adjustment from other comprehensive income to retained earnings |  |  |  |  |  | ¥ 251,600 | $ 36,100
PPDAI Group Inc. | Common Stock | Maximum |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Percentage of investee's issued share capital | 20.00% |  |  |  | 20.00% |  |
Held-to-maturity investments |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Investment income | ¥ 5,711 |  | 19,740 | ¥ 22,090 |  |  |
Held to maturity investment, gross unrecognized holding gain | 4,565 |  | 5,863 |  |  |  |
Other-than-temporary impairment losses on held-to-maturity investments | 104,365 |  | ¥ 0 |  |  |  |
Held-to-maturity securities, 2021 |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Held-to-maturity investments, long-term | ¥ 36,816 |  |  |  |  |  |

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