Quarterly Results (Detail) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015 USD ($) $ / shares bbl	Sep. 26, 2015 USD ($) $ / shares bbl	Jun. 27, 2015 USD ($) $ / shares bbl	Mar. 28, 2015 USD ($) $ / shares bbl	Dec. 27, 2014 USD ($) $ / shares bbl	Sep. 27, 2014 USD ($) $ / shares bbl	Jun. 28, 2014 USD ($) $ / shares bbl	Mar. 29, 2014 USD ($) $ / shares bbl	Dec. 26, 2015 USD ($) $ / shares	Dec. 27, 2014 USD ($) $ / shares	Dec. 28, 2013 USD ($) $ / shares
Quarterly Financial Information [Line Items]
Barrels sold | bbl	958,000	1,284,000	1,125,000	889,000	983,000	1,229,000	1,054,000	838,000
Net revenue	$ 215,133	$ 293,094	$ 252,204	$ 199,503	$ 217,817	$ 269,734	$ 231,611	$ 183,845	$ 1,024,040	$ 966,478	$ 793,705
Gross profit	108,767	157,010	136,225	99,615	108,400	142,996	123,096	90,519	501,617	465,011	384,922
Operating income	26,338	60,879	46,819	22,138	32,036	60,647	40,493	13,391	156,174	146,567	113,093
Net Income	$ 16,115	$ 38,624	$ 29,932	$ 13,743	$ 19,074	$ 37,926	$ 25,428	$ 8,315	$ 98,414	$ 90,743	$ 70,392
Net income per share - basic | $ / shares	$ 1.25	$ 2.93	$ 2.24	$ 1.04	$ 1.46	$ 2.91	$ 1.95	$ 0.64	$ 7.46	$ 6.96	$ 5.47
Net income per share - diluted | $ / shares	$ 1.21	$ 2.85	$ 2.18	$ 1.00	$ 1.40	$ 2.79	$ 1.88	$ 0.62	$ 7.25	$ 6.69	$ 5.18