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White Eagle Revolving Credit Facility - Additional Information (Detail)
3 Months Ended 9 Months Ended
Apr. 29, 2013
USD ($)
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Contract
Debt Instrument [Line Items]              
Number of policies owned (contracts) | Contract   634   634     607
Life insurance policies with aggregate death benefit   $ 2,997,903,000   $ 2,997,903,000     $ 2,931,066,000
Life insurance estimated fair value   457,810,000   457,810,000     388,886,000
Interest expense on the facility   8,614,000 $ 4,303,000 21,491,000 $ 11,165,000    
Interest expense withheld from borrowings by lender       5,566,000 4,962,000    
Interest paid       12,143,000 4,496,000    
Revolving Credit Facility debt, at estimated fair value             $ 145,831,000
Revolving Credit Facility              
Debt Instrument [Line Items]              
Revolving Credit Facility debt, at estimated fair value   157,946,000   157,946,000   $ 157,946,000  
White Eagle Asset Portfolio, LLC | Revolving Credit Facility              
Debt Instrument [Line Items]              
Proceeds to be paid to White Eagle after payment of loan       $ 76,100,000      
Percentage of remaining proceeds       50.00%      
White Eagle | Revolving Credit Facility              
Debt Instrument [Line Items]              
Revolving credit facility effective date Apr. 29, 2013            
Revolving credit facility period 15 years            
Revolving Credit facility, current borrowing capacity $ 300,000,000.0 161,800,000   $ 161,800,000      
Line of credit facility, maximum borrowing capacity   140,100,000.0   140,100,000.0      
Line of credit facility, remaining borrowing capacity   $ 1,900,000   $ 1,900,000      
Collateral pledge percentage for distributions to be altered   25.00%   25.00%      
Base rate   0.50%   0.50%      
Debt instrument effective rate   5.50%   5.50%      
Interest expense on the facility   $ 2,300,000 2,100,000 $ 6,900,000 5,800,000    
Interest expense withheld from borrowings by lender   1,700,000 1,500,000 5,000,000 4,200,000    
Interest paid   634,000 $ 573,000 $ 1,900,000 $ 1,600,000    
Credit agreement expiration date       Apr. 28, 2028      
Revolving Credit Facility debt, at estimated fair value   157,900,000   $ 157,900,000      
Revolving Credit Facility debt, outstanding   $ 159,900,000   $ 159,900,000      
White Eagle | Revolving Credit Facility | Maintenance Costs              
Debt Instrument [Line Items]              
Line of credit borrowing base percentage   100.00%   100.00%      
White Eagle | Revolving Credit Facility | Accrued and Unpaid Interest              
Debt Instrument [Line Items]              
Line of credit borrowing base percentage   100.00%   100.00%      
Proceeds directed to pay outstanding interest and principal on loan       100.00%      
White Eagle | Revolving Credit Facility | Other Fees and Expense [Member]              
Debt Instrument [Line Items]              
Line of credit borrowing base percentage   100.00%   100.00%      
White Eagle | Revolving Credit Facility | Policies pledged as collateral as determined by the lenders              
Debt Instrument [Line Items]              
Line of credit borrowing base percentage   75.00%   75.00%      
White Eagle | Revolving Credit Facility | Policies pledged as collateral excluding certain specified life insurance policies              
Debt Instrument [Line Items]              
Line of credit borrowing base percentage   50.00%   50.00%      
White Eagle | Revolving Credit Facility | Securities Pledged as Collateral              
Debt Instrument [Line Items]              
Revolving Credit facility, current borrowing capacity $ 300,000,000 $ 300,000,000.0   $ 300,000,000.0      
Number of policies owned (contracts) | Contract   439   439      
Life insurance policies with aggregate death benefit   $ 2,200,000,000   $ 2,200,000,000      
Life insurance estimated fair value   $ 327,400,000   $ 327,400,000      
White Eagle | Revolving Credit Facility | Floor Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.50%      
White Eagle | Revolving Credit Facility | Applicable Margin              
Debt Instrument [Line Items]              
Basis spread on variable rate       4.00%      
White Eagle | Revolving Credit Facility | Federal Funds Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       0.75%      
White Eagle | White Eagle Asset Portfolio, LLC | Revolving Credit Facility              
Debt Instrument [Line Items]              
Proceeds to be paid to White Eagle after payment of loan       $ 76,100,000      
Percentage of remaining proceeds       50.00%