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Summary of Significant Accounting Policies - Impacts of the Collectability Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Summary of Significant Accounting Policies |  |  |
Rental revenue | $ 1,461 | $ 288 | $ (3,305)
Provision for (recovery of) doubtful accounts | 2,363 | 459 | 1,412
Total (income) expense impact | $ 3,824 | $ 747 | $ (1,893)

X
- Definition Amount of provision for (recovery of) doubtful accounts. + References No definition available. + Details
Name: | seg_LossContingencyAccrualProvisionReversal
Namespace Prefix: | seg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating lease provision for uncollectible lease income. + References No definition available. + Details
Name: | seg_OperatingLeaseProvisionForUncollectibleLeaseIncome
Namespace Prefix: | seg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total amount of operating lease provision for uncollectible lease income and amount of provision for (recovery of) doubtful accounts. + References No definition available. + Details
Name: | seg_Operatingleaseprovisionforuncollectibleleaseincomeandlosscontingencyprovision
Namespace Prefix: | seg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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