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Components of Net Periodic Benefit Cost (Narrative) (Detail) - USD ($) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2007 | Jun. 30, 2023 | Dec. 31, 2002
Retirement Benefits [Abstract] |  |  |
Service period for employees of coverage age, years (at least) |  | 1 year |
Defined benefit plan, percentage vested |  | 100.00% |
Retiree benefits eliminated if less than service period, years (less than) | 10 years |  | 10 years
Defined benefit plan, contributions by employer |  | $ 0 |

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