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Schedule of Rollforward of Level Three Assets and Liabilities Held at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity indexed annuity contracts      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period $ (57,531) $ (55,871) $ (64,138)
Level 3 liabilities, Total gains (losses) included in net income 12,584 (1,660) 8,267
Level 3 liabilities, Total gains (losses) included in OCI 0 0 0
Level 3 liabilities, Transfers into Level 3 0 0 0
Level 3 liabilities, Transfers out of Level 3 0 0 0
Level 3 liabilities, Purchases 0 0 0
Level 3 liabilities, Sales 0 0 0
Level 3 liabilities, Issues 0 0 0
Level 3 liabilities, Settlements 0 0 0
Level 3 liabilities, Balance at end of period (44,947) (57,531) (55,871)
Asset-backed securities ("ABS")      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period 17,933 26,135 14,260
Level 3 liabilities, Total gains (losses) included in net income 81 1,509 (53)
Level 3 liabilities, Total gains (losses) included in OCI (632) 873 347
Level 3 liabilities, Transfers into Level 3 1,931   3,093
Level 3 liabilities, Transfers out of Level 3 (16,157) (8,828)  
Level 3 liabilities, Purchases   16,817 11,165
Level 3 liabilities, Issues 0 0 0
Level 3 liabilities, Settlements (2,371) (18,573) (2,677)
Level 3 liabilities, Balance at end of period 785 17,933 26,135
GMWB/GMAB      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period [1] (4,670) (6,835) (7,814)
Level 3 liabilities, Total gains (losses) included in net income [1] (646) 2,165 979
Level 3 liabilities, Total gains (losses) included in OCI [1] 0 0 0
Level 3 liabilities, Transfers into Level 3 [1] 0 0 0
Level 3 liabilities, Transfers out of Level 3 [1] 0 0 0
Level 3 liabilities, Purchases [1] 0 0 0
Level 3 liabilities, Sales [1] 0 0 0
Level 3 liabilities, Issues [1] 0 0 0
Level 3 liabilities, Settlements [1] 0 0 0
Level 3 liabilities, Balance at end of period [1] (5,316) (4,670) (6,835)
All other corporate securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period 18,351 19,351 11,520
Level 3 liabilities, Total gains (losses) included in net income (27) (8) (123)
Level 3 liabilities, Total gains (losses) included in OCI (26) 121 (246)
Level 3 liabilities, Transfers into Level 3     15,370
Level 3 liabilities, Transfers out of Level 3 (965)   (4,483)
Level 3 liabilities, Sales (2,077)   (955)
Level 3 liabilities, Issues 0 0 0
Level 3 liabilities, Settlements (2,647) (1,113) (1,732)
Level 3 liabilities, Balance at end of period 12,609 18,351 19,351
United States Government, Government Agencies and Authorities      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period 4,897 6,573  
Level 3 liabilities, Total gains (losses) included in net income (1,297) (1,308) (491)
Level 3 liabilities, Total gains (losses) included in OCI 211 (368) 187
Level 3 liabilities, Transfers out of Level 3 (3,477)    
Level 3 liabilities, Purchases     6,877
Level 3 liabilities, Issues 0 0 0
Level 3 liabilities, Balance at end of period 334 4,897 6,573
Common Stock      
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period 8,152 5,100  
Level 3 liabilities, Purchases 110 3,052 5,100
Level 3 liabilities, Sales (1,274)    
Level 3 liabilities, Issues 0 0 0
Level 3 liabilities, Balance at end of period $ 6,988 $ 8,152 $ 5,100
[1] These amounts are 100% ceded in accordance with the Company's reinsurance agreements.