Concentrations (Detail)	12 Months Ended
	Dec. 31, 2015 employee supplier customer	Dec. 31, 2014 employee supplier union	Dec. 31, 2013 employee supplier union
Concentration Risk [Line Items]
Concentration risk, number of suppliers | supplier	10	10	10
Ten Largest Customers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	42.00%	46.00%	44.00%
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, number of customers | customer	10
Grain Supplier [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	31.00%	35.00%	50.00%
Concentration risk, number of suppliers | supplier	2	1	1
Ten Largest Suppliers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	75.00%	70.00%	77.00%
Net Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Workforce Subject to Collective Bargaining Arrangements [Member]
Concentration Risk [Line Items]
Number of employees	293	268	268
Workforce Subject to Collective Bargaining Arrangements [Member] | Number of Employees [Member]
Concentration Risk [Line Items]
Number of employees	102	143	145
Workforce Subject to Collective Bargaining Arrangements [Member] | Lawrencenceburg Facility [Member]
Concentration Risk [Line Items]
Number of employees	56
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, number of unions | union		2	2