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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, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,283,157 $ 4,939,325
Gross Unrealized Gains 155,169 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 104,206 32,269
Estimated Fair Value 5,334,120 5,150,018
Non - credit other - than - temporary Impairments 41,673 7,773
Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 2,588,556 2,743,050
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,942,285  
Estimated Fair Value 1,977,338  
Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 85,706  
Estimated Fair Value 84,267  
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 802,842  
Estimated Fair Value 840,527  
Short-Term [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 225,789 360,069
Gross Unrealized Gains 1 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1 4
Estimated Fair Value 225,789 360,065
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,992,756 4,514,878
Gross Unrealized Gains 155,168 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 104,148 32,154
Estimated Fair Value 5,043,776 4,725,686
Non - credit other - than - temporary Impairments 41,673 7,773
Fixed Income Securities [Member] | Securities Pledged as Collateral [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 64,612 64,378
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 57 111
Estimated Fair Value 64,555 64,267
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 424,048 523,019
Gross Unrealized Gains 4,910 9,769
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 8,188 6,996
Estimated Fair Value 420,770 525,792
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 1,610,912 1,382,195
Gross Unrealized Gains 7,089 12,815
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 24,332 9,416
Estimated Fair Value 1,593,669 1,385,594
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 96,638 126,041
Gross Unrealized Gains 1,491 3,060
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1,823 1,344
Estimated Fair Value 96,306 127,757
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 26,086 42,328
Gross Unrealized Gains 789 1,078
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 188 427
Estimated Fair Value 26,687 42,979
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 64,612 64,378
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 57 111
Estimated Fair Value 64,555 64,267
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 4,239 29,524
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 27 38
Estimated Fair Value 4,212 29,486
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,942,285 1,557,059
Gross Unrealized Gains 99,670 167,396
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 64,617 13,500
Estimated Fair Value 1,977,338 1,710,955
Non - credit other - than - temporary Impairments 41,673 7,773
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 85,706 21,346
Gross Unrealized Gains 42 50
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 1,481 274
Estimated Fair Value 84,267 21,122
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 802,842 833,366
Gross Unrealized Gains 41,177 48,794
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 3,492 159
Estimated Fair Value 840,527 882,001
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 5,218,545 4,874,947
Gross Unrealized Gains 155,169 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 104,149 32,158
Estimated Fair Value 5,269,565 5,085,751
Non - credit other - than - temporary Impairments $ 41,673 $ 7,773