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Amortized Cost/Cost, Gross Unrealized Gains and Losses, Estimated Fair Values and ("OTTI") Reflected in ("AOCI") of Investments in Fixed Maturity and Equity Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost $ 1,182,244 $ 1,418,128
Gross Unrealized Gains 72,729 133,646
Gross Unrealized Losses (12,460) (3,136)
Fixed maturity available-for-sale securities, at estimated fair value 1,242,513 1,548,638
Equity available-for-sale securities, cost 0 25,473
Gross Unrealized Gains   3,024
Equity available-for-sale securities, at estimated fair value   28,497
Gross Unrealized OTTI in AOCI [1]   0
Corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 777,859 885,440
Gross Unrealized Gains 28,373 58,766
Gross Unrealized Losses (9,814) (2,182)
Fixed maturity available-for-sale securities, at estimated fair value 796,418 942,024
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 55,797 56,852
Gross Unrealized Gains 37 241
Gross Unrealized Losses (579) (187)
Fixed maturity available-for-sale securities, at estimated fair value 55,255 56,906
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 61,168 72,373
Gross Unrealized Gains 500 1,397
Gross Unrealized Losses (1,343) (449)
Fixed maturity available-for-sale securities, at estimated fair value 60,325 73,321
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 45,013 74,385
Gross Unrealized Gains 6,859 7,076
Gross Unrealized Losses (7) (44)
Fixed maturity available-for-sale securities, at estimated fair value 51,865 81,417
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 904 906
Gross Unrealized Losses (17) (25)
Fixed maturity available-for-sale securities, at estimated fair value 887 881
Government and government agencies - United States    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 209,098 298,223
Gross Unrealized Gains 36,126 63,998
Gross Unrealized Losses (241) (102)
Fixed maturity available-for-sale securities, at estimated fair value 244,983 362,119
Government and government agencies - Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 26,614 24,158
Gross Unrealized Gains 834 2,168
Gross Unrealized Losses (256) (46)
Fixed maturity available-for-sale securities, at estimated fair value 27,192 26,280
Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 5,791 5,791
Gross Unrealized Losses (203) (101)
Fixed maturity available-for-sale securities, at estimated fair value $ 5,588 5,690
Banking securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity available-for-sale securities, cost   25,473
Gross Unrealized Gains   3,024
Equity available-for-sale securities, at estimated fair value   28,497
Gross Unrealized OTTI in AOCI [1]   $ 0
[1] Represents OTTI in AOCI, which were not reflected in earnings. Amount excludes $3,296 and $3,364 of unrealized gains at June 30, 2018 and December 31, 2017, respectively.