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Income Taxes - Additional Information (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($)
Income Taxes [Line Items] |  |  |  |  |
Income tax rate |  | 25.00% | 25.00% | 25.00% |
Operating loss carry forward |  | ¥ 0 |  |  |
Deferred tax asset allowance |  | ¥ 56,653,000 | ¥ 15,651,000 |  | $ 8,137
Term of operating loss carry forward |  | 5 years |  |  |
Withholding income tax rate | 10.00% |  |  |  |
Accumulated undistributed earnings of Group's PRC subsidiaries |  | ¥ 3,300,000,000 |  |  |
Withholding tax rate on dividends distributed by a FIE |  | 10.00% |  |  |
Reduced withholding tax rate, if the foreign investor owns directly at least 25% of the shares of the FIE |  | 5.00% |  |  |
Minimum percentage of equity interest in a PRC-resident enterprise to be held by a qualified Hong Kong tax resident for reduced withholding tax rate |  | 25.00% |  |  |
Undistributed earning |  | ¥ 4,734,992,000 | 3,946,107,000 |  | $ 680,139
Increase in unrecognized tax benefit |  | ¥ 0 | ¥ 0 | ¥ 0 |
If the underpayment of taxes is due to computational errors made by the taxpayer or withholding agent |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefit, statute of limitations |  | 3 years |  |  |
If underpayment of tax liability exceeding RMB100 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefit, statute of limitations |  | 5 years |  |  |
Underpayment of income tax liability threshold that qualifies as special circumstance for statute of limitations |  | ¥ 100,000 |  |  |
In the case of a related party transaction |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefit, statute of limitations |  | 10 years |  |  |
Earliest Tax Year |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carry forwards expiration year |  | 2020 |  |  |
Latest Tax Year |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carry forwards expiration year |  | 2025 |  |  |
Inland Revenue, Hong Kong |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax rate |  | 16.50% |  |  |
State Administration of Taxation, People's Republic of China |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax rate |  | 25.00% |  |  |
Peoples Republic of China and Hong Kong |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carry forward |  | ¥ 861,692,000 |  |  |
Variable Interest Entity, Primary Beneficiary | Mainland of China |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Undistributed earning |  | ¥ 1,500,000,000 |  |  |

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