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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Credit valuation adjustment included in fair value of credit derivative liabilities   $ 1,810 $ 1,924
Credit valuation adjustment included in fair value of derivative liabilities other than credit derivatives   42,894 $ 44,943
Additional basis point fee need to receive for issuing a CDS on obligation 0.05%    
Additional basis points fee increase on change of reference obligation spread 0.15%    
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs     2.60%
Minimum [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Basis point fee received for issuing a CDS on reference obligation base fee 0.20%    
Credit spread of reference obligation of a base transaction 0.80%    
Maximum [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Basis point fee received for issuing a CDS on reference obligation hypothetical fee 0.25%    
Credit spread of reference obligation of revised transaction 1.00%    
Successor [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Other investments   478,688 $ 450,307
Notional outstanding   $ 722,492 737,380
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs   2.60%  
Available-for-sale Securities   $ 5,855,962 $ 6,049,908
Successor [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Percentage of investment portfolio valued using dealer quotes   5.00% 5.00%
PercentageofInvestedPortfiliowhereProjectedCashFlowsConsistSolelyofDeferredAmountsandInterest   11.00% 12.00%
Successor [Member] | U.S. Agency Obligations [Member] | Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Available-for-sale Securities   $ 0 $ 0
Successor [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Available-for-sale Securities   655,817 696,713
Successor [Member] | Corporate Obligations [Member] | Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Available-for-sale Securities   0 0
Successor [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Available-for-sale Securities   $ 0 $ 0
Successor [Member] | Minimum [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Percentage of investment portfolio valued using internal valuation models   12.00% 13.00%
Successor [Member] | Maximum [Member] | Fixed Income Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Percentage of investment portfolio valued using external pricing services   83.00% 82.00%
Variable Interest Entities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs   3.30% 3.60%
Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member] | Corporate Obligations [Member] | Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Available-for-sale Securities   $ 2,663,719 $ 2,622,566