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Revenue Recognition - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Payment terms	120 days

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- References

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Namespace Prefix:	son_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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