Segment Reporting - Schedule of Financial Data for Each Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues from fuel sales	$ 296,784	$ 218,304
Rent income	5,508	3,352
Other revenue	137	423
Total revenues	482,021	471,861
Net income (loss)	1,428	3,757
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from fuel sales	471,189
Wholesale [Member]
Segment Reporting Information [Line Items]
Rent income	9,641
Other revenue	137
Total revenues	472,350
Net income (loss)	8,455
Wholesale [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from fuel sales	417,887
Wholesale [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues from fuel sales	44,685
Retail [Member]
Segment Reporting Information [Line Items]
Rent income	1,054
Total revenues	54,356
Net income (loss)	265
Retail [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from fuel sales	53,302
Unallocated [Member]
Segment Reporting Information [Line Items]
Total revenues	(44,685)
Net income (loss)	(7,292)
Unallocated [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues from fuel sales	$ (44,685)