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Notes Receivable and Allowance for Credit Losses - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023
Receivables [Abstract] |
Weighted average days outstanding of notes receivable | 34 days

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- Definition Financing Receivable, Excluding Accrued Interest, Weighted Average Days Outstanding + References No definition available. + Details
Name: | szl_FinancingReceivableExcludingAccruedInterestWeightedAverageDaysOutstanding
Namespace Prefix: | szl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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