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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) - Successor [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,271,818 $ 5,931,045
Gross Unrealized Gains 145,386 198,505
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 108,043 79,642
Estimated Fair Value 5,309,161 6,049,908
Non - credit other - than - temporary Impairments 23,832 35,232
Below Investment Grade Securities and Non-Rated Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Aggregate Losses 100,503 53,273
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Fair Value 1,855,694 890,952
Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 2,914,145 2,622,566
Short-Term [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 557,476 430,827
Gross Unrealized Gains 3 5
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 209 44
Estimated Fair Value 557,270 430,788
Non - credit other - than - temporary Impairments 0 0
Ambac Wrapped Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 30,482  
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,614,623 5,435,385
Gross Unrealized Gains 145,383 198,428
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 107,834 79,598
Estimated Fair Value 4,652,172 5,554,215
Non - credit other - than - temporary Impairments 23,832 35,232
Fixed Income Securities [Member] | Securities Pledged as Collateral [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 99,719 64,833
Gross Unrealized Gains 0 72
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Estimated Fair Value 99,719 64,905
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 845,778 376,064
Gross Unrealized Gains 3,456 5,509
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 69,400 7,205
Estimated Fair Value 779,834 374,368
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 858,774 1,803,136
Gross Unrealized Gains 6,772 19,589
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 5,471 20,560
Estimated Fair Value 860,075 1,802,165
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | Foreign Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26,245 41,932
Gross Unrealized Gains 409 1,303
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 111 100
Estimated Fair Value 26,543 43,135
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | U.S. Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 86,900 33,732
Gross Unrealized Gains 261 2,551
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1,753 97
Estimated Fair Value 85,408 36,186
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | U.S. Government Obligations [Member] | Securities Pledged as Collateral [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 99,719 64,833
Gross Unrealized Gains 0 72
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Estimated Fair Value 99,719 64,905
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | U.S. Agency Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   4,063
Gross Unrealized Gains   0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments   3
Estimated Fair Value   4,060
Non - credit other - than - temporary Impairments   0
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,214,512 2,284,425
Gross Unrealized Gains 67,303 110,955
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 30,482 43,785
Estimated Fair Value 2,251,333 2,351,595
Non - credit other - than - temporary Impairments 23,832 35,232
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 50,754 113,650
Gross Unrealized Gains 283 493
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 220
Estimated Fair Value 51,037 113,923
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 531,660 778,383
Gross Unrealized Gains 66,899 58,028
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 617 7,628
Estimated Fair Value 597,942 828,783
Non - credit other - than - temporary Impairments 0 0
Fixed Income Investments And Other Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,172,099 5,866,212
Gross Unrealized Gains 145,386 198,433
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 108,043 79,642
Estimated Fair Value 5,209,442 5,985,003
Non - credit other - than - temporary Impairments $ 23,832 $ 35,232