Income Taxes - Schedule of Deferred Income Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating losses	$ 118,203	$ 130,880
Property and equipment	12,077	12,380
Accruals and accrued loss contingencies	9,484	8,043
Gross deferred income tax assets	139,764us-gaap_DeferredTaxAssetsGross	151,303us-gaap_DeferredTaxAssetsGross
Prepaid expenses	(951)	(398)
Other	(408)us-gaap_DeferredTaxLiabilitiesOther	(3)us-gaap_DeferredTaxLiabilitiesOther
Intangible assets	(72)	(2,742)
Gross deferred income tax liabilities	(1,431)us-gaap_DeferredIncomeTaxLiabilities	(3,143)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax assets	138,333us-gaap_DeferredTaxAssetsNet	148,160us-gaap_DeferredTaxAssetsNet
Valuation allowance	(114,190)	(119,277)
Total deferred income tax assets	$ 24,143us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 28,883us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount of deferred tax liability attributable to taxable temporary differences.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Liability

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from contingent liabilities.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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