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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2011
Tax Credit Carryforward [Line Items]    
Income Tax Examination, Penalties and Interest Accrued   $ 3,650,000
NOL allocated amount $ 4,057,680  
AFG [Member]    
Tax Credit Carryforward [Line Items]    
NOL allocated amount 1,389,646  
Percentage Of Notional Federal Tax Liability   50.00%
U. S. Federal Net Operating Tax [Member]    
Tax Credit Carryforward [Line Items]    
NOL allocated amount 3,985,606  
Capital Loss Carryforward [Member] | United States [Member]    
Tax Credit Carryforward [Line Items]    
NOL allocated amount $ 72,074  
Minimum [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2029  
Maximum [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2033