Aggregate dividends declared during the period for each share of common stock outstanding.

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Accounting Policies and Basis of Presentation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended			3 Months Ended		0 Months Ended
	Mar. 26, 2015	Apr. 09, 2014	Feb. 28, 2014	Mar. 31, 2015	Mar. 31, 2014	Apr. 21, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Common stock, dividends, per share, declared (in Dollars per share)	$ 0.06		$ 0.05
Payments of dividends		$ 907us-gaap_PaymentsOfDividends
Dividends paid with cash		884us-gaap_DividendsCommonStockCash
Dividend equivalent payments		23us-gaap_DividendsCommonStockPaidinkind
Shipping and handling revenue				3,399us-gaap_ShippingAndHandlingRevenue	3,490us-gaap_ShippingAndHandlingRevenue
Insurance recoveries					460us-gaap_InsuranceRecoveries
Debt instrument, fair value disclosure				10,301us-gaap_DebtInstrumentFairValue			10,297us-gaap_DebtInstrumentFairValue
Long-term debt, gross				10,233us-gaap_DebtInstrumentCarryingAmount			10,283us-gaap_DebtInstrumentCarryingAmount
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments of dividends						1,087
Dividends paid with cash						1,061
Dividend equivalent payments						$ 26