Acquisition and Divestitures - Schedule of Liabilities Recorded (Detail) - Idaho Dairy Farm [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2014 USD ($)
Restructuring Reserve [Roll Forward]
Accrued charges at December 31, 2013	$ 3,306
Costs paid or otherwise settled	(1,360)
Reversal of prior expense	(406)
Accrued charges at June 30, 2014	1,540
Lease Liability [Member]
Restructuring Reserve [Roll Forward]
Accrued charges at December 31, 2013	2,674
Costs paid or otherwise settled	(762)
Reversal of prior expense	(351)
Accrued charges at June 30, 2014	1,561
Severance and related costs [Member]
Restructuring Reserve [Roll Forward]
Accrued charges at December 31, 2013	632
Costs paid or otherwise settled	(598)
Reversal of prior expense	(55)
Accrued charges at June 30, 2014	$ (21)