Equity Method Investments (Detail) - The Company’s Equity in Earnings (Loss) of Joint Ventures (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	$ 71		$ (143)		$ (871)		$ 294
ICP (30% interest)
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	62	[1]	(110)	[1]	(907)	[1]	363	[1]
D.M. Ingredients GmbH [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings (loss) of joint ventures	$ 9		$ (33)		$ 36		$ (69)

[1] The Company’s ownership percentage of ICP was 50 percent through February 1, 2012, when the Company sold 20 percent of its investment. From February 2, 2012 through June 30, 2013, the Company’s ownership percentage in ICP was 30 percent. From April 1, 2013 through June 30, 2013, the Company's allocation of net income (loss) was 12 percent, as previously discussed.