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Long-Term Debt (Detail) $ / shares in Units, ¥ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2020 CNY (¥) | Apr. 30, 2019 USD ($) | Apr. 30, 2019 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Jun. 30, 2020 CNY (¥) | Jun. 01, 2020 $ / shares | Apr. 30, 2019 CNY (¥) | Apr. 01, 2019 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  |  |  |  |  | ¥ 8,482,370 |  | ¥ 3,488,100 |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | (141,448) |  | (73,472) |  |  |  |
2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount |  |  | $ 500,000,000.0 |  |  | 3,262,500 |  | 3,488,100 |  |  |  |
Long-term debt interest rate |  |  | 1.375% |  |  |  |  |  |  |  | 1.375% |
Proceeds from issuance of Long-term Debt, net of issuance cost |  |  | $ 488,200,000 | ¥ 3,356,100 |  |  |  |  |  |  |  |
Long-term debt issuance cost |  |  | $ 11,800,000 |  |  |  |  |  |  |  | ¥ 81,100 |
Debt instrument repurchase face amount percentage |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |
Interest expense debt |  |  |  |  | $ 8,500,000 | 58,600 | $ 6,400,000 | 44,900 |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | 58,100 |  | ¥ 73,500 |  |  |  |
2027 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt principal amount | $ 800,000,000.0 |  |  |  |  | 5,219,900 |  |  |  |  |  |
Long-term debt interest rate | 1.25% |  |  |  |  |  |  |  | 1.25% |  |  |
Proceeds from issuance of Long-term Debt, net of issuance cost | $ 786,100,000 | ¥ 5,594,800 |  |  |  |  |  |  |  |  |  |
Long-term debt issuance cost | $ 13,900,000 |  |  |  |  |  |  |  | ¥ 98,600 |  |  |
Debt instrument repurchase face amount percentage | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |
Interest expense debt |  |  |  |  | $ 6,900,000 | 46,800 | $ 0 |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | ¥ 83,300 |  |  |  |  |  |
American Depository Shares [Member] | 2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, conversion rate |  |  | 0.0404040 | 0.0404040 |  |  |  |  |  |  |  |
Convertible debt, conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 24.75
American Depository Shares [Member] | 2027 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, conversion rate | 0.0245516 | 0.0245516 |  |  |  |  |  |  |  |  |  |
Convertible debt, conversion price | $ / shares |  |  |  |  |  |  |  |  |  | $ 40.73 |  |

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