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Summary of Significant Accounting Policies - Liquidity and Going Concern (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Dec. 31, 2023
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Capital contributed |  | $ 384,893
Howard Hughes Holdings Inc. |  |
Capital contributed | $ 23,400 |

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- Definition The amount of net parent investment. + References No definition available. + Details
Name: | seg_NetParentInvestment
Namespace Prefix: | seg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=seg_HowardHughesHoldingIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |