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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
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost $ 1,219,443 $ 1,418,128
Gross Unrealized Gains 84,730 133,646
Gross Unrealized Losses (9,852) (3,136)
Fixed maturity available-for-sale securities, at estimated fair value 1,294,321 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 821,572 885,440
Gross Unrealized Gains 38,678 58,766
Gross Unrealized Losses (6,602) (2,182)
Fixed maturity available-for-sale securities, at estimated fair value 853,648 942,024
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 50,647 56,852
Gross Unrealized Gains 19 241
Gross Unrealized Losses (460) (187)
Fixed maturity available-for-sale securities, at estimated fair value 50,206 56,906
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 61,223 72,373
Gross Unrealized Gains 638 1,397
Gross Unrealized Losses (1,208) (449)
Fixed maturity available-for-sale securities, at estimated fair value 60,653 73,321
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 37,680 74,385
Gross Unrealized Gains 6,794 7,076
Gross Unrealized Losses (903) (44)
Fixed maturity available-for-sale securities, at estimated fair value 43,571 81,417
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 905 906
Gross Unrealized Losses (21) (25)
Fixed maturity available-for-sale securities, at estimated fair value 884 881
Government and government agencies - United States    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 217,502 298,223
Gross Unrealized Gains 37,267 63,998
Gross Unrealized Losses (300) (102)
Fixed maturity available-for-sale securities, at estimated fair value 254,469 362,119
Government and government agencies - Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 24,123 24,158
Gross Unrealized Gains 1,334 2,168
Gross Unrealized Losses (167) (46)
Fixed maturity available-for-sale securities, at estimated fair value 25,290 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 (191) (101)
Fixed maturity available-for-sale securities, at estimated fair value $ 5,600 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 $3,358 and $3,364 of unrealized gains at March 31, 2018 and December 31, 2017, respectively.