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Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 8,199,135 $ 7,131,539 $ 6,380,514 $ 5,814,468 $ 4,022,234
Available-for-sale Securities | States and political subdivisions          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 17,581 $ 499      
Valuation Technique Discounted cash flow Discounted cash flow      
Available-for-sale Securities | Foreign government          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 34,142 $ 33,373 34,050 34,147 33,284
Valuation Technique Discounted cash flow Matrix pricing      
Available-for-sale Securities | Public utilities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value   $ 649,858   521,199 201,195
Valuation Technique   Matrix pricing      
Available-for-sale Securities | Corporate securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 8,078,960 $ 6,371,739   5,212,561 3,727,803
Valuation Technique Discounted cash flow Matrix pricing      
Available-for-sale Securities | Collateralized debt obligations          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 21,821 $ 21,164 28,804 45,229 56,872
Valuation Technique Discounted cash flow Intex discounted cash flows      
Available-for-sale Securities | Mortgage-backed securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 46,631 $ 54,906 10,679 1,332 3,080
Valuation Technique Discounted cash flow Intex discounted cash flows      
Reserve at Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ (21,143,511) $ (18,096,009) (17,002,372) (17,052,283) (11,943,461)
Reserve at Fair Value | MVLO          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ (15,733,827) $ (14,495,312)      
Valuation Technique Discounted cash flow Discounted cash flow      
Reserve at Fair Value | GMWB and GMAB          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ (3,678,280) $ (2,545,396)      
Valuation Technique Discounted cash flow Discounted cash flow      
Derivative Assets          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 61,871 $ 2,350 35,969 11,583 8,666
Derivative Assets | Total Return Swap          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Spread and discount rates [1]      
Derivative Assets | Total Return Swap | Third Party Pricing Valuation Technique          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ 61,871 $ 2,350      
Valuation Technique Third-Party Vendor Third-Party Vendor      
Derivative liability          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ (11,940) $ (33,812) $ (55,960) $ (757) $ (29,251)
Derivative liability | Total Return Swap          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Spread and discount rates [1] [2]      
Derivative liability | Total Return Swap | Third Party Pricing Valuation Technique          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Fair Value $ (11,940) $ (33,812)      
Valuation Technique Third-Party Vendor Third-Party Vendor      
Minimum          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Annuitizations   2.30%      
Minimum | Available-for-sale Securities | States and political subdivisions          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 204 206      
Minimum | Available-for-sale Securities | Foreign government          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 162 132      
Minimum | Available-for-sale Securities | Public utilities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread   94      
Minimum | Available-for-sale Securities | Corporate securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 44 40      
Minimum | Available-for-sale Securities | Collateralized debt obligations          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Constant prepayment rate 0.00% 0.00%      
Unobservable Input, Loss severity 12.00% 12.00%      
Unobservable Input, Annual default rate 0.19% 0.19%      
Minimum | Available-for-sale Securities | Mortgage-backed securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Constant prepayment rate 0.00% 0.00%      
Unobservable Input, Loss severity 12.00% 12.00%      
Unobservable Input, Annual default rate 0.19% 0.19%      
Minimum | Reserve at Fair Value | MVLO          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Annuitizations 0.00% 0.00%      
Unobservable Input, Surrenders 0.00% 0.00%      
Unobservable Input, Mortality 0.00% [2] 0.00%      
Unobservable Input, Withdrawal Benefit Election 0.00% 0.00%      
Minimum | Reserve at Fair Value | GMWB and GMAB          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Surrenders 0.50% 0.50%      
Unobservable Input, Mortality [2] 0.00%        
Maximum          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Annuitizations   6.00%      
Maximum | Available-for-sale Securities | States and political subdivisions          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 204 206      
Maximum | Available-for-sale Securities | Foreign government          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 193 182      
Maximum | Available-for-sale Securities | Public utilities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread   492      
Maximum | Available-for-sale Securities | Corporate securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 2,121 1,415      
Maximum | Available-for-sale Securities | Collateralized debt obligations          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Constant prepayment rate 25.00% 25.00%      
Unobservable Input, Loss severity 100.00% 100.00%      
Unobservable Input, Annual default rate 100.00% 100.00%      
Maximum | Available-for-sale Securities | Mortgage-backed securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Constant prepayment rate 25.00% 25.00%      
Unobservable Input, Loss severity 100.00% 100.00%      
Unobservable Input, Annual default rate 100.00% 100.00%      
Maximum | Reserve at Fair Value | MVLO          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Annuitizations 25.00% 25.00%      
Unobservable Input, Surrenders 25.00% 25.00%      
Unobservable Input, Mortality 100.00% [2] 100.00%      
Unobservable Input, Withdrawal Benefit Election 50.00% 50.00%      
Maximum | Reserve at Fair Value | GMWB and GMAB          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Surrenders 35.00% 35.00%      
Unobservable Input, Mortality [2] 100.00%        
Weighted Average | Available-for-sale Securities | States and political subdivisions          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 204 206      
Weighted Average | Available-for-sale Securities | Foreign government          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 183 165      
Weighted Average | Available-for-sale Securities | Public utilities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread   193      
Weighted Average | Available-for-sale Securities | Corporate securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]          
Unobservable Input, Option adjusted spread 183 234      
[1] Management does not have insight into the specific assumptions used. See narrative below for qualitative discussion.
[2] Mortality assumptions are derived by applying management determined factors to the Annuity 2000 Mortality Table for MVLO and actively issued GMWB and GMAB and the 1994 MGDB Mortality Table for all other GMWB and GMAB.