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Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Valuation allowance against deferred tax asset	$ 17,600,000
Percentage of change in ownership for operating loss carryforward	50.00%
Annual limitation on use of pre-ownership change losses	284,000
Pre-ownership change losses	36,200,000
Carryforward period of ownership	20 years
Utilize pre-ownership change losses	5,600,000
Write-off of deferred tax assets		$ 10,400,000

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Percentage of change in ownership for operating loss carryforward.

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Possible utilization amount of pre change net operating losses and net built in deduction.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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