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Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Detail) - Successor [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ (19,581) $ (3,439)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 11,122 9,016
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized investment gains 8,835 8,229
Net of tax and noncontrolling interest 8,835 8,229
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 8,835 8,229
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,287 787
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net of tax and noncontrolling interest 11,122 9,016
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) 0 0
Prior service cost (241) (166)
Actuarial gains (losses) 2,528 953
Total before tax 2,287 787
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 2,287 $ 787