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Leases - Narrative (Details)	3 Months Ended
Leases - Narrative (Details)	Mar. 31, 2019
Leases [Abstract]
Remaining lease term	54 years

X

- Definition

Lease, Remaining Lease Term

+ References

No definition available.

+ Details

Name:	splp_LeaseRemainingLeaseTerm
Namespace Prefix:	splp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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