Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 85,072	$ 83,880	$ 92,071	$ 84,864	$ 83,901	$ 83,966	$ 85,903	$ 84,582	$ 345,887		$ 338,352		$ 334,070
Less: excise tax	3,563	3,552	6,717	4,451	7,576	6,451	5,336	5,586	18,283		24,949		10,806
Net sales	81,509	80,328	85,354	80,413	76,325	77,515	80,567	78,996	327,604		313,403		323,264
Cost of sales	65,754	68,466	67,826	67,025	70,314	70,204	72,259	72,195	269,071	[1]	284,972	[1]	302,025	[1]
Gross profit	15,755	11,862	17,528	13,388	6,011	7,311	8,308	6,801	58,533		28,431		21,239
Selling, general and administrative expenses	5,681	5,497	8,025	6,480	4,897	4,966	5,166	5,072	25,683		20,101		26,202
Insurance recoveries					(7,067)	(1,293)	70	0	0		(8,290)		0
Other operating costs and loss on sale of assets, net					0	1	0	0	0		1		236
Operating income (loss)	10,074	6,365	9,503	6,908	8,181	3,637	3,072	1,729	32,850		16,619		(5,199)
Equity In earnings (loss)	92	1,562	3,096	1,352	2,850	1,621	2,331	3,335	6,102		10,137		(204)
Interest expense	(160)	(114)	(129)	(131)	(201)	(199)	(218)	(198)	(534)		(816)		(1,118)
Income (loss) from continuing operations before income taxes	10,006	7,813	12,470	8,129	10,830	5,059	5,185	4,866	38,418		25,940		(6,521)
Income tax expense (benefit) (Note 5)	3,527	1,042	4,599	3,059	3,267	(1,169)	86	81	12,227		2,265		(714)
Net income (loss)	$ 6,479	$ 6,771	$ 7,871	$ 5,070	$ 7,563	$ 6,228	$ 5,099	$ 4,785	$ 26,191		$ 23,675		$ (4,929)
Basic and diluted earnings per share data (in dollars per share)	$ 0.38	$ 0.38	$ 0.44	$ 0.28	$ 0.42	$ 0.34	$ 0.28	$ 0.26	$ 1.48		$ 1.32		$ (0.29)
Dividends per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.06	$ 0	$ 0	$ 0	$ 0.05	$ 0.06		$ 0.05		$ 0.05

[1] Includes related party purchases of $41,255, $38,498, and $9,988 for the years ended December 31, 2015, 2014, and 2013, respectively.