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Income Taxes - Additional Information (Details) $ in Thousands, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2008 | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 HKD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 HKD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 HKD ($) | Dec. 31, 2021 USD ($)
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |
Operating loss carry forward |  | ¥ 0 |  |  |  |  |  |
Term of operating loss carry forward |  | 5 years | 5 years |  |  |  |  |
Withholding income tax rate | 10.00% |  |  |  |  |  |  |
Accumulated undistributed earnings of Group's PRC subsidiaries |  | ¥ 4,600,000,000 |  |  |  |  |  |
Withholding tax rate on dividends distributed by a FIE |  | 10.00% | 10.00% |  |  |  |  |
Reduced withholding tax rate, if the foreign investor owns directly at least 25% of the shares of the FIE |  | 5.00% | 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% | 25.00% |  |  |  |  |
Undistributed earning |  | ¥ 5,187,323,000 |  | ¥ 3,989,767,000 |  |  |  | $ 814,005
Increase in unrecognized tax benefit |  | ¥ 0 |  | ¥ 0 |  | ¥ 0 |  |
Earliest Tax Year |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forwards expiration year |  | 2022 | 2022 |  |  |  |  |
Latest Tax Year |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forwards expiration year |  | 2027 | 2027 |  |  |  |  |
Inland Revenue, Hong Kong |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  | 16.50% | 16.50% |  |  |  |  |
State Administration of Taxation, People's Republic of China |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  | 25.00% | 25.00% |  |  |  |  |
Hong Kong |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Assessable profits threshold for preferential income tax rate | $ |  |  | $ 2 |  | $ 2 |  | $ 2 |
Preferential Income Tax Rate |  | 8.25% | 8.25% |  |  |  |  |
Statutory income tax rate |  | 16.50% | 16.50% |  |  |  |  |
Peoples Republic of China and Hong Kong |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Preferential Income Tax Rate |  | 15.00% | 15.00% |  |  |  |  |
Operating loss carry forward |  | ¥ 2,019,141,000 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Mainland China |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Undistributed earning |  | ¥ 2,400,000,000 |  |  |  |  |  |

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