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Earnings Per Common Share - Narrative (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Earnings Per Share [Abstract] |  |  |  |
Options with exercise price in excess of average market price for the period (in shares) | 0 | 61,270 | 0 | 61,270

X
- Definition Options With Exercise Price in Excess of Average Market Price for Period Presented + References No definition available. + Details
Name: | king_OptionsWithExercisePriceInExcessOfAverageMarketPriceForPeriodPresented
Namespace Prefix: | king_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration