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Accounts Receivable Securitization (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Accounts Receivable Securitization [Abstract] |  |  |  |
Proceeds from accounts receivable securitization program | $ 60,000 | $ 40,000 |  |
Accounts receivable securitization program | $ 102,000 | 60,600 | $ 96,400 | $ 58,700
Fair value of the deferred purchase price receivable |  | $ 20,600 | $ 36,400 | $ 18,700

X
- Definition Accounts receivable sold via securitization program. + References No definition available. + Details
Name: | sxt_AccountsReceivableSoldViaSecuritizationProgram
Namespace Prefix: | sxt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of fair value of the deferred purchase price receivable. + References No definition available. + Details
Name: | sxt_FairValueOfDeferredPurchasePriceReceivable
Namespace Prefix: | sxt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of proceeds owed to the reporting entity by a third party for the sale of trade receivables. + References No definition available. + Details
Name: | sxt_ProceedsReceivedByTheCompanyForTheSaleOfTradeReceivablesFromAThirdParty
Namespace Prefix: | sxt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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