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Income Taxes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Jurisdictions	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Customary rate	35.00%	35.00%	35.00%
Cumulative common stock ownership change over three year period that would limit federal and state net operating loss carry forwards	50.00%
State jurisdiction currently under review | Jurisdictions	1
U.S. Federal
Income Taxes [Line Items]
Net operating loss, Tax Credit Carryforward, Amount	$ 745,190
State Taxes
Income Taxes [Line Items]
Net operating loss, Tax Credit Carryforward, Amount	1,521,847
Valuation allowance on net operating loss carryforwards	$ 1,400,000

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Income taxes.

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Number of state jurisdiction currently under review.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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.

+ References

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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