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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2011
Tax Credit Carryforward [Line Items]
Income Tax Examination, Penalties and Interest Accrued	$ 3,650,000
NOL allocated amount	$ 4,110,272
Operating tax carryforward expiration year start	2029
Operating tax carryforward expiration year end	2032
AFG [Member]
Tax Credit Carryforward [Line Items]
Percentage Of Notional Federal Tax Liability		50.00%
U. S. Federal Net Operating Tax [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 4,021,786
Capital Loss Carryforward [Member] | United States [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 88,486

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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