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Commitments and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Long-term Purchase Commitment [Line Items]
Commitments	$ 40,892
Letter of credit outstanding	2,000
MMBTU Natual Gas Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments	6,892
Pounds Of Flour Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments	9,117
Capital Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase commitments	$ 614

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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