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

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Schedule Of 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, Net 1,047,000 71,000 3,244,000 146,000    
United States Operations
            
Schedule Of Income Taxes [Line Items]            
Income Tax Expense, Net     4,000,000      
Change in U.S. Tax Status From Partnership to Corporation
            
Schedule Of Income Taxes [Line Items]            
Income Tax Expense, Net     4,200,000      
Prepayments of debt.
            
Schedule Of Income Taxes [Line Items]            
Income Tax Expense, Net     $ (5,000,000)