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v3.19.1

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

X
- References No definition available. + Details
Name: | son_ContractWithCustomerPaymentTerms
Namespace Prefix: | son_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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