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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Credit valuation adjustment included in fair value of credit derivative liabilities $ 10,124 $ 15,910
Credit valuation adjustment included in fair value of derivative liabilities other than credit derivatives $ 78,728 64,547
Percentage of CDS gross par outstanding used in the determination of CDS fair values 93.00%  
Percentage of CDS derivative liability used in the determination of CDS fair values 43.00%  
Percentage of CDS gross par outstanding using internally estimated reference obligation prices in determination of fair value 7.00%  
Percentage of CDS liability using internally estimated reference obligation prices in determination of fair value 57.00%  
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%  
Revised relative change ratio of CDS fee to cash market spread 73.20%  
Estimated remaining life 8 years  
Notional outstanding $ 970,883 1,529,759
Derivative liabilities $ 34,543 $ 73,459
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs 2.70% 2.70%
Credit Derivatives [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 22.70% 17.80%
European ABS Transactions [Member] | Level 3 [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Fair value of consolidated VIE debt obligations valued using unobservable inputs by asset class $ 3,016,966 $ 1,070,439
US Commercial ABS Transaction [Member] | Level 3 [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Fair value of consolidated VIE debt obligations valued using unobservable inputs by asset class $ 163,204 $ 193,225
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%  
Relative change ratio of CDS fee to cash market spread 25.00%  
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%  
Relative change ratio of CDS fee to cash market spread 35.00% 35.00%
Credit spread of reference obligation of revised transaction 1.00%  
Internal Credit Rating [Member] | Minimum [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Revised relative change ratio of CDS fee to cash market spread 33.00%  
Internal Credit Rating [Member] | Maximum [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Full relative change ratio of CDS fee to cash market spread 100.00%  
Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Notional outstanding $ 970,883 $ 1,529,759
Available-for-sale Securities $ 5,334,120 $ 5,150,018
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 9.00% 10.00%
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] | Asset-backed Securities [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 488,884 $ 194,393
Successor [Member] | Corporate Obligations [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Coupon rate   0.345%
Successor [Member] | Corporate Obligations [Member] | Level 3 [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Fair value of investments in corporate obligation securities classified as Level 3 in the fair value hierarchy 0 $ 3,808
Available-for-sale Securities 0 3,808
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 9.00% 4.00%
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 82.00% 86.00%
Collateralized Loan Obligations [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 8.34% 5.40%
Fair value of derivative liabilities $ 1,837 $ 2,027
Notional outstanding $ 295,253 $ 549,923
Fair Value Input Weighted Average Obligation Price $ 98.4 $ 98.9
Fair Value Input Weighted Average Life 1 year 1 month 1 year 9 months
Fair Value Input Weighted Average Credit Rating AA AA
Fair Value Input Weighted Average Relative Change Ratio 36.30% 35.90%
Underlying, Other [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 23.34% 15.82%
Fair value of derivative liabilities $ 32,697 $ 71,104
Notional outstanding $ 617,148 $ 921,036
Fair Value Input Weighted Average Obligation Price $ 85.2 $ 86.8
Fair Value Input Weighted Average Life 6 years 1 month 5 years 8 months
Fair Value Input Weighted Average Credit Rating BBB+ BBB-
Fair Value Input Weighted Average Relative Change Ratio 33.30% 49.00%
Variable Interest Entity, Primary Beneficiary [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 4.40% 4.10%
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 $ 2,588,556 $ 2,743,050
Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member] | European ABS Transactions [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Coupon rate 1.38% 0.30%
Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member] | US Commercial ABS Transaction [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Coupon rate 5.88% 5.88%