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Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Lessee, Lease, Description [Line Items]
Payments expected to be made on leases not yet commenced	$ 1,789
Rent expense under operating leases		$ 18,901
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal terms	1 year
Contract terms for leases not yet commenced	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal terms	50 years
Contract terms for leases not yet commenced	6 years 4 months 24 days

X

- Definition

Lessee, Lease Not Yet Commenced, Liability

+ References

No definition available.

+ Details

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Namespace Prefix:	son_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Lessee, Lease, Renewal Term

+ References

No definition available.

+ Details

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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_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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Period Type:	duration

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