Subsequent Events - Additional Information (Detail) (USD $)	9 Months Ended							1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended		12 Months Ended	0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Rights of First Refusal [Member]	Sep. 30, 2014 Rights Of First Offer [Member]	Sep. 30, 2014 Phantom Units [Member]	Sep. 30, 2014 Phantom Units [Member] Dunne Manning Inc. (DMI) [Member]	Sep. 30, 2014 Profits Interests [Member]	Sep. 30, 2013 Profits Interests [Member]	Mar. 31, 2014 Common Units [Member]	Dec. 31, 2014 Forecast [Member]	Sep. 30, 2014 Nice N Easy Acquisition [Member]	Sep. 30, 2014 Amended and Restated Omnibus Agreement [Member]	Dec. 31, 2013 Sale of Wholesale Fuel Supply Contracts [Member] Gallon	Dec. 31, 2013 Sub Wholesaler Contract [Member] Gallon	Dec. 31, 2013 Single Customer [Member] Gallon	Oct. 01, 2014 Subsequent Events [Member] Minimum [Member]	Oct. 01, 2014 Subsequent Events [Member] Phantom Units [Member]	Oct. 01, 2014 Subsequent Events [Member] Phantom Units [Member] Dunne Manning Inc. (DMI) [Member]	Oct. 01, 2014 Subsequent Events [Member] Profits Interests [Member]	Oct. 01, 2014 Subsequent Events [Member] Profits Interests [Member] Mr. Topper [Member]	Oct. 01, 2014 Subsequent Events [Member] Common Units [Member]	Oct. 01, 2014 Subsequent Events [Member] Common Units [Member] Lehigh Gas Corporation [Member]	Nov. 01, 2014 Subsequent Events [Member] Nice N Easy Acquisition [Member]	Oct. 01, 2014 Subsequent Events [Member] Topper Employment Agreement [Member]	Oct. 01, 2014 Subsequent Events [Member] Topper Employment Agreement [Member] Mr. Topper [Member]	Oct. 01, 2014 Subsequent Events [Member] Sale of Wholesale Fuel Supply Contracts [Member] Location Sublease	Oct. 01, 2014 Subsequent Events [Member] Sale of Wholesale Fuel Supply Contracts [Member]
Subsequent Event [Line Items]
Initial term of agreement											5 years												1 year
Additional renewable term of Agreement											1 year												1 year
Notice period for termination											180 days												60 days
Business combination right of first descriptions		Rights of First Refusal. The Amended Omnibus Agreement provides that Mr. Topper, DMI and LGO agree, and are required to cause their controlled affiliates to agree, that for so long as Mr. Topper is an officer or director of the General Partner or CST, if (a) Mr. Topper, DMI, LGO, or any of their controlled affiliates have the opportunity to acquire assets used, or a controlling interest in any business primarily engaged, in the wholesale motor fuel distribution or retail gas station operation businesses, and (b) the assets or businesses proposed to be acquired have a value exceeding $5.0 million in the aggregate, then Mr. Topper, DMI, LGO, or their controlled affiliates will offer such acquisition opportunity to the Partnership and give the Partnership a reasonable opportunity to acquire, at the same price plus any related transaction costs and expenses, such assets or business, either before or promptly after the consummation of such acquisition by Mr. Topper, DMI, LGO, or their controlled affiliates.	Rights of First Offer. The Amended Omnibus Agreement provides that Mr. Topper, DMI and LGO agree, and are required to cause their controlled affiliates to agree, for so long as Mr. Topper is an officer or director of the General Partner or CST, to notify the Partnership of their desire to sell any of their assets or businesses if (a) Mr. Topper, DMI, LGO, or any of their controlled affiliates, decides to attempt to sell (other than to another controlled affiliate of Mr. Topper, DMI or LGO) any assets used, or any interest in any business primarily engaged, in the wholesale motor fuel distribution or retail gas station operation businesses, to a third party and (b) the assets or businesses proposed to be sold have a value exceeding $5.0 million in the aggregate. Prior to selling such assets or businesses to a third party, Mr. Topper, DMI and LGO are required to negotiate with the Partnership exclusively and in good faith for a reasonable period of time in order to give the Partnership an opportunity to enter into definitive documentation for the purchase and sale of such assets or businesses on terms that are mutually acceptable to Mr. Topper, DMI, LGO, or their controlled affiliates, and the Partnership. If the Partnership and Mr. Topper, DMI, LGO, or their controlled affiliates have not entered into a letter of intent or a definitive purchase and sale agreement with respect to such assets or businesses within such period, Mr. Topper, DMI, LGO, and their controlled affiliates, have the right to sell such assets or businesses to a third party following the expiration of such period on any terms that are acceptable to Mr. Topper, DMI, LGO, or their controlled affiliates, and such third party.
Amended agreement effective date	Oct. 01, 2014
Voting agreement date	Oct. 01, 2014
Description of voting agreement	The Voting Agreement will remain in effect with respect to any Topper Seller for so long as any such Topper Seller is (a) a director or officer of CST or affiliate thereof, including the Partnership, (b) the beneficial owner of more than 3% of the outstanding common stock of CST or (c) the beneficial owner of 10% or more of the outstanding common units or subordinated units of the Partnership.
Directors period of office															5 years
Executive compensation per year																								$ 525,000
Percentage of short term incentive																							75.00%
Percentage of incentive as equity award																							2.00
Number of awards granted to employees																167,535	97,043	9,622	5,670
Aggregate purchase price of Contract																										5,700,000
Earn-out amount purchase price of Contract																										800,000
Number of lease locations terminated																									78
Number of subleases locations assigned to DMI or its affiliates																									12
Volume of contract												94,000,000	36,000,000	28,000,000
Contract expiration year														2015
Rent expense for the leasehold sites												600,000
Amount recognized in excess of purchase price over the net book value of the net assets																									2,100,000
Units issued								4,172												2,045	101,456
Number of awards granted to directors				2,045		9,481	5,948									2,045		15,429
Incremental charge recorded on accelerated vesting of shares									4,600,000
Date of vesting period for units issued				Nov. 10, 2015	Mar. 15, 2015
Units issued to employees vest and unvested description					These units vest in one-third increments annually starting March 15, 2015. In addition, all unvested outstanding awards to certain employees of DMI were modified such that if within two years of a change in control, the employee is terminated involuntarily or the employee terminates his or her service due to a material reduction in base salary or a requirement to relocate his or her primary place of employment more than a specified distance from his or her current principal place of residence, then the awards will vest immediately and the employee will be paid as specified in the agreements.
Fair market value of units issued																70,000
Effective date of agreement to purchase										Nov. 01, 2014
Aggregate cash consideration																						$ 65,000,000