Net Income per Limited Partnership Unit - Narrative (Details)	12 Months Ended
Dec. 31, 2015 $ / shares
Equity Method Investments and Joint Ventures [Abstract]
General Partner Incentive Percentage Of Limited Partner Distribution	15.00%
General Partner Incentive Threshold From Limited Partner Distribution Per Unit	$ 0.5031

The percentage of quarterly distribution out of operating surplus, in excess of a threshold level distributed to limited partners, that may be distributed to the General Partner in the form of incentive distribution rights (IDR's).

No definition available.

Name:	cst_GeneralPartnerIncentivePercentageOfLimitedPartnerDistribution
Namespace Prefix:	cst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration