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Commitments and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Long-term Purchase Commitment [Line Items]
Commitments	$ 27,506
MMBTU Natual Gas Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments	9,422
Pounds Of Flour Dollar Equivalent [Member]
Long-term Purchase Commitment [Line Items]
Commitments	5,305
Capital Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Aggregate purchase commitments	$ 1,273

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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