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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