Equity Method Investments (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 29, 2014
ICP Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
EBITDA		$ 500,000
DMI [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage (percent)	50.00%		50.00%
ICP [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage (percent)	26.40%		26.40%		30.00%
Income allocation to objecting member (as a percent)	80.00%		80.00%
Income allocation to electing member (percent)	20.00%		20.00%
Decrease in related equity method investment earnings due to reassessment			1,882,000
Decrease in earnings per share			$ 0.10
Related party sales to MGPI	9,287,000	110,000	23,905,000	3,510,000
Depreciation and amortization	$ 738,000	$ 1,171,000	$ 2,100,000	$ 3,511,000
Decrease in equity method investment earnings (as a percent)			24.00%
ICP [Member] | ICP Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage by parent (percent)	70.00%		70.00%