Accrued Expense - Components of Accrued Expense (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Salaries and wages	$ 688us-gaap_AccruedSalariesCurrent	$ 621us-gaap_AccruedSalariesCurrent
Payroll taxes	182us-gaap_AccruedPayrollTaxesCurrent	165us-gaap_AccruedPayrollTaxesCurrent
Simplified employee pension plan contributions	209	209
Legal and professional fees	157us-gaap_AccruedProfessionalFeesCurrent	120us-gaap_AccruedProfessionalFeesCurrent
Casualty loss claims	407	460
Other	167us-gaap_OtherAccruedLiabilitiesCurrent	102us-gaap_OtherAccruedLiabilitiesCurrent
Total	$ 1,810us-gaap_AccruedLiabilitiesCurrent	$ 1,677us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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