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Net Income per Share - Additional Information (Detail) - shares |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 03, 2023 | May 24, 2023 | May 17, 2023 | May 02, 2023 | Mar. 01, 2023 | Mar. 01, 2020 | Mar. 01, 2019 | Jan. 01, 2019 | Sep. 30, 2023 | Sep. 24, 2022 | Sep. 30, 2023 | Sep. 24, 2022 | Dec. 31, 2022
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  | 83,797 |  |  |  |
Stock option outstanding |  |  |  |  |  |  |  |  | 201,299 |  | 201,299 |  | 204,245
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  |  | 12,318 | 76,548 | 25,309 |
Unvested Share Based Payments |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  | 31,962 |  | 32,962 |  |
Investment Share Program |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Investment Share Program | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requirement tenure of employee for investment share program, purchase shares at discount |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Discount from current market value |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Investment Share Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requirement tenure of employee for investment share program, purchase shares at discount |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Discount from current market value |  |  |  |  |  |  |  |  |  |  | 40.00% |  |
Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years | 4 years | 1 year | 4 years | 4 years | 4 years | 4 years | 5 years |  |  |  |  |
Performance Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option outstanding |  |  |  |  |  |  |  |  | 10,421 | 1,348 | 10,421 | 1,348 |
Performance Based Awards | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares not included because the performance criteria was not expected to be met |  |  |  |  |  |  |  |  |  |  | 21,835 | 17,114 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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