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Deferred Tax Assets and Liabilities, Current (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Deferred Income Taxes
Accrued Revenue, Current Portion	$ 3,038	$ 6,583
Other, net	90us-gaap_DeferredTaxAssetsOther	108us-gaap_DeferredTaxAssetsOther
Total Current Deferred Income Tax Liabilities	$ 3,128us-gaap_DeferredTaxLiabilitiesCurrent	$ 6,691us-gaap_DeferredTaxLiabilitiesCurrent

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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