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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Credit valuation adjustment included in fair value of credit derivative liabilities $ 1,924 $ 10,124
Credit valuation adjustment included in fair value of derivative liabilities other than credit derivatives $ 44,943 78,728
Percentage of CDS gross par outstanding using internally estimated reference obligation prices in determination of fair value 0.00%  
Percentage of CDS liability using internally estimated reference obligation prices in determination of fair value 0.00%  
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 $ 737,380 970,883
Derivative liabilities $ 15,349 $ 34,543
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs 2.60% 2.70%
Credit Derivatives [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 11.10% 22.70%
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 $ 2,551,278 $ 3,016,966
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 $ 30,942 $ 163,204
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%  
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]    
Other investments $ 450,307 $ 310,600
Notional outstanding 737,380 970,883
Available-for-sale Securities $ 6,049,908 $ 5,334,120
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% 9.00%
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]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Coupon rate 5.93%  
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 $ 65,990 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 696,713 488,884
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 13.00% 9.00%
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% 82.00%
Collateralized Loan Obligations [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 7.47% 8.34%
Fair value of derivative liabilities $ 213 $ 1,837
Notional outstanding $ 123,052 $ 295,253
Fair Value Input Weighted Average Obligation Price $ 99.5 $ 98.4
Fair Value Input Weighted Average Life 1 year 9 months 1 year 1 month
Fair Value Input Weighted Average Credit Rating AA AA
Fair Value Input Weighted Average Relative Change Ratio 36.60% 36.30%
Underlying, Other [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
CVA percentage 11.19% 23.34%
Fair value of derivative liabilities $ 15,136 $ 32,697
Notional outstanding $ 614,328 $ 617,148
Fair Value Input Weighted Average Obligation Price $ 92.3 $ 85.2
Fair Value Input Weighted Average Life 5 years 11 months 6 years 1 month
Fair Value Input Weighted Average Credit Rating A- BBB+
Fair Value Input Weighted Average Relative Change Ratio 30.60% 33.30%
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 3.60% 4.40%
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 $ 2,622,566 $ 2,588,556
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 0.46% 1.38%
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%
Real Estate [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Other investments $ 33,303 $ 59,719
Hedge Funds, Multi-strategy [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Other investments 53,985 35,464
Interest Rate Contract [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Other investments 210,157 99,579
Illiquid Investments [Member] | Successor [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Other investments $ 39,068 $ 44,754