General form of registration statement for all companies including face-amount certificate companies

Income Tax Expense - Additional Information (Detail)

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Income Tax Expense - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]            
Total losses available for carry forward         $ 110,500,000 $ 116,900,000
Effective income tax rate reconciliation at federal statutory income tax rate         35.00%  
U.S.-sourced dividends and interest withholding tax         30.00%  
Income tax expense 7,933,000 398,000 11,177,000 544,000    
Reduction of income tax expense due to implementation of a global tax platform (6,600,000)   (6,600,000)      
Expense due to change in U.S. tax status
            
Income Taxes [Line Items]            
Income tax expense     4,200,000      
Debt prepayments
            
Income Taxes [Line Items]            
Income tax expense     $ 2,600,000