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Leases - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 renewal_option
Lessee, Lease, Description [Line Items]
Number of renewal options	1
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	50 years

X

- Definition

Lessee, Lease, Number of Renewal Options

+ References

No definition available.

+ Details

Name:	son_LesseeLeaseNumberOfRenewalOptions
Namespace Prefix:	son_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Lease, Renewal Term

+ References

No definition available.

+ Details

Name:	son_LesseeLeaseRenewalTerm
Namespace Prefix:	son_
Data Type:	xbrli:durationItemType
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

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: