Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2011
Tax Credit Carryforward [Line Items]
Income Tax Examination, Penalties and Interest Accrued	$ 3,650,000
NOL allocated amount	$ 4,245,743
Operating tax carryforward expiration year start	2029
Operating tax carryforward expiration year end	2032
AFG [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 1,387,903
Percentage Of Notional Federal Tax Liability		50.00%
U. S. Federal Net Operating Tax [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	4,152,591
United States [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 93,152