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Share-based Payments - Additional Information (Detail) $ / shares in Units, ¥ in Thousands |  |  | 12 Months Ended |  |  |
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Mar. 31, 2021 USD ($) shares | Dec. 21, 2019 shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 $ / shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2021 USD ($) | Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares, total weighted average grant-date fair value granted | $ / shares |  |  |  | $ 2.04 | $ 0.78 |  | $ 0.74 |  |  |  |  |
Restricted shares,Aggregate Fair value |  |  | ¥ 90,121 | $ 14,142,000 |  | ¥ 91,683 |  | ¥ 19,580 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement vesting period | 1 year |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrrangement intrinsic value of options excercised during the period |  |  | 79,224 | $ 12,432,000 |  | 906,120 |  | 308,665 |  |  |  |
Share based compensation by share based payment arrangement weighted average grant date fair value of awards granted during the period | $ / shares |  |  |  | $ 2.80 | 1.16 |  | 0.65 |  |  |  |  |
Share based compensation by share based payment arrangement aggregatte fair value of shares vested during the period |  |  | 51,892 | $ 8,143,000 |  | 44,135 |  | 36,060 |  |  |  |
Share based compensation by share based payment arrangement unrecognised compensation |  |  | ¥ 119,582 |  |  |  |  |  | $ 18,765,000 |  |  |
Share based compensation by share based payment arrangement unrecognized compensation recognition period |  |  | 1 year 4 months 28 days | 1 year 4 months 28 days |  |  |  |  |  |  |  |
Share Options Scheme [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement number of shares authorised |  |  |  |  |  |  |  |  |  |  |  | 209,750,000
Share based compensation by share based payment arrrangement intrinsic value of options excercised during the period |  |  | ¥ 1,561 | $ 245,000 |  | 3,230 |  |  |  |  |  |
Share based compensation by share based payment arrangement weighted average grant date fair value of awards granted during the period | $ / shares |  |  |  | $ 2.80 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognized compensation recognition period |  |  | 1 year 10 months 9 days | 1 year 10 months 9 days |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognised compensation |  |  | ¥ 315,641 |  |  |  |  |  | 49,531,000 |  |  |
Number of options - Exercised |  |  | 29,906,941 | 29,906,941 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement awards granted |  |  | 12,292,710 | 12,292,710 |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognized compensation recognition period | 2 years |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognised compensation |  |  |  |  |  |  |  |  |  | ¥ 101,871 | $ 15,986,000 |
Restricted shares, Number of shares Granted | 11,684,432 |  |  |  |  |  |  |  |  |  |  |
Restricted shares,Aggregate Fair value | $ | $ 2,278,360,000 |  |  |  |  |  |  |  |  |  |  |
Camelot Award [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement vesting period |  |  | 3 years | 3 years |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognized compensation recognition period |  |  | 1 year 8 months 1 day | 1 year 8 months 1 day |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognised compensation |  |  | ¥ 95,165 |  |  |  |  |  | 14,933,000 |  |  |
2013 Share Award Scheme [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement number of shares authorised |  |  |  |  |  |  |  |  |  |  |  | 215,376,304
Share based compensation by share based payment arrangement weighted average grant date fair value of awards granted during the period | $ / shares |  |  |  | $ 0.31 | $ 0.31 |  | $ 0.30 |  |  |  |  |
Share based compensation by share based payment arrangement aggregatte fair value of shares vested during the period |  |  | ¥ 16,192 | $ 2,541,000 |  | ¥ 15,981 |  | ¥ 0 |  |  |  |
Share based compensation by share based payment arrangement unrecognized compensation recognition period |  |  | 1 year 1 month 28 days | 1 year 1 month 28 days |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement unrecognised compensation |  |  | ¥ 12,898 |  |  |  |  |  | $ 2,024,000 |  |  |
Number of options - Exercised |  | 0 | 8,081,820 | 8,081,820 |  |  |  |  |  |  |  |
Restricted shares, Number of shares Granted |  |  | 29,076,828 | 29,076,828 |  |  |  |  |  |  |  |
Restricted shares, total weighted average grant-date fair value granted | $ / shares |  |  |  | $ 2.04 |  |  |  |  |  |  |  |
2021 Share Award Scheme [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement number of shares authorised |  |  |  |  |  |  |  |  |  |  |  | 209,216,310
Share based compensation by share based payment arrangement awards granted |  |  | 0 | 0 |  |  |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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