Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014 Jurisdictions	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Customary rate	35.00%	35.00%	35.00%
Valuation allowance on net operating loss carryforwards	$ 46,639,000	$ 35,507,000
State jurisdictions currently under review	2
U.S. Federal
Income Taxes [Line Items]
Net operating loss carryforwards	34,700,000
Net operating loss carryforwards limitation on use	limited to approximately $1.1 million per year pursuant to a prior change of control of an acquired company
Net operating loss carryforwards limitations	1,100,000
Valuation allowance on net operating loss carryforwards	23,000,000
Tax effect of valuation allowance on net operating loss carryforwards	8,000,000
Louisiana Tax Authority \| State and Local Jurisdiction
Income Taxes [Line Items]
Valuation allowance on net operating loss carryforwards	742,200,000	528,100,000
Tax effect of valuation allowance on net operating loss carryforwards	$ 38,600,000	$ 27,500,000

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Number of state jurisdiction currently under review.

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- Definition

Operating loss carryforwards limitations.

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No definition available.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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