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Significant Accounting Policies - Summary of Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2022
Building | Minimum
Property Plant And Equipment [Line Items]
Buildings	36 years
Building | Maximum
Property Plant And Equipment [Line Items]
Buildings	40 years
Leasehold And Buildings Improvements
Property Plant And Equipment [Line Items]
Leasehold and buildings improvements	Shorter of lease term or expected useful life
Electronic And Office Equipment | Minimum
Property Plant And Equipment [Line Items]
Buildings	3 years
Electronic And Office Equipment | Maximum
Property Plant And Equipment [Line Items]
Buildings	5 years

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905813&loc=d3e1205-110223

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=stg_LeaseholdAndBuildingsImprovementsMember
Namespace Prefix:
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X

- Details

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