Sale of Receivables (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 759.2	$ 693.6
Charge related to sale of receivables	$ 19.3	$ 14.3	$ 13.1

The amount of charges incurred relating to the sale of receivables during the reporting period.

No definition available.

Name:	smp_SaleOfReceivablesRelatedCharges
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration