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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
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,044,988 $ 4,939,325
Gross Unrealized Gains 160,508 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 81,102 32,269
Estimated Fair Value 5,124,394 5,150,018
Non - credit other - than - temporary Impairments 13,726 7,773
Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 2,747,181 2,743,050
Short-Term [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 197,070 360,069
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 4
Estimated Fair Value 197,070 360,065
Non - credit other - than - temporary Impairments 0 0
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,813,186 4,514,878
Gross Unrealized Gains 160,337 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 81,102 32,154
Estimated Fair Value 4,892,421 4,725,686
Non - credit other - than - temporary Impairments 13,726 7,773
Fixed Income Securities [Member] | Securities Pledged as Collateral [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 34,732 64,378
Gross Unrealized Gains 171 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 111
Estimated Fair Value 34,903 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 455,279 523,019
Gross Unrealized Gains 4,935 9,769
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 10,871 6,996
Estimated Fair Value 449,343 525,792
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 1,635,662 1,382,195
Gross Unrealized Gains 9,134 12,815
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 19,905 9,416
Estimated Fair Value 1,624,891 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 112,875 126,041
Gross Unrealized Gains 1,279 3,060
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 4,132 1,344
Estimated Fair Value 110,022 127,757
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 58,527 42,328
Gross Unrealized Gains 469 1,078
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 683 427
Estimated Fair Value 58,313 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 34,732 64,378
Gross Unrealized Gains 171 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 111
Estimated Fair Value 34,903 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 4,327 29,524
Gross Unrealized Gains 0 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 9 38
Estimated Fair Value 4,318 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 1,881,009 1,557,059
Gross Unrealized Gains 127,506 167,396
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 45,107 13,500
Estimated Fair Value 1,963,408 1,710,955
Non - credit other - than - temporary Impairments 13,726 7,773
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 86,834 21,346
Gross Unrealized Gains 122 50
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 329 274
Estimated Fair Value 86,627 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 578,673 833,366
Gross Unrealized Gains 16,892 48,794
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 66 159
Estimated Fair Value 595,499 882,001
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 5,010,256 4,874,947
Gross Unrealized Gains 160,337 242,962
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 81,102 32,158
Estimated Fair Value 5,089,491 5,085,751
Non - credit other - than - temporary Impairments $ 13,726 $ 7,773