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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
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost $ 1,173,737 $ 1,418,128
Gross Unrealized Gains 63,509 133,646
Gross Unrealized Losses (12,726) (3,136)
Fixed maturity available-for-sale securities, at estimated fair value 1,224,520 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 785,816 885,440
Gross Unrealized Gains 26,379 58,766
Gross Unrealized Losses (9,535) (2,182)
Fixed maturity available-for-sale securities, at estimated fair value 802,660 942,024
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 40,921 56,852
Gross Unrealized Gains 3 241
Gross Unrealized Losses (676) (187)
Fixed maturity available-for-sale securities, at estimated fair value 40,248 56,906
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 61,112 72,373
Gross Unrealized Gains 435 1,397
Gross Unrealized Losses (1,469) (449)
Fixed maturity available-for-sale securities, at estimated fair value 60,078 73,321
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 43,141 74,385
Gross Unrealized Gains 8,478 7,076
Gross Unrealized Losses (59) (44)
Fixed maturity available-for-sale securities, at estimated fair value 51,560 81,417
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 903 906
Gross Unrealized Losses (3) (25)
Fixed maturity available-for-sale securities, at estimated fair value 900 881
Government and government agencies - United States    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 209,476 298,223
Gross Unrealized Gains 27,107 63,998
Gross Unrealized Losses (286) (102)
Fixed maturity available-for-sale securities, at estimated fair value 236,297 362,119
Government and government agencies - Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 26,577 24,158
Gross Unrealized Gains 1,107 2,168
Gross Unrealized Losses (282) (46)
Fixed maturity available-for-sale securities, at estimated fair value 27,402 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 (416) (101)
Fixed maturity available-for-sale securities, at estimated fair value $ 5,375 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 $3,888 and $3,364 of unrealized gains at September 30, 2018 and December 31, 2017, respectively.