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Summary of Aggregate Fair Value and Gross Unrealized Loss by Length of Time Securities had Continuously been in Gross Unrealized Loss Position as Well as Number of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value   $ 911,581
Less than 12 months Gross Unrealized Losses   (6,271)
Greater than 12 months Fair Value   508,338
Greater than 12 months Gross Unrealized Losses   (9,913)
Fair Value   1,419,919
Gross Unrealized Losses   (16,184)
Fixed Maturities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value $ 1,216,029 849,475
Less than 12 months Gross Unrealized Losses (27,511) (4,666)
Greater than 12 months Fair Value 917,659 505,906
Greater than 12 months Gross Unrealized Losses (33,038) (9,846)
Fair Value 2,133,688 1,355,381
Gross Unrealized Losses (60,549) (14,512)
Fixed Maturities | U.S. Treasury Bonds, Agency Bonds and Foreign Government Bonds    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 101,395 273,672
Less than 12 months Gross Unrealized Losses (2,486) (1,502)
Greater than 12 months Fair Value 112,195 54,484
Greater than 12 months Gross Unrealized Losses (1,471) (512)
Fair Value 213,590 328,156
Gross Unrealized Losses (3,957) (2,014)
Fixed Maturities | States, Municipalities and Political Subdivisions    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 123,479 74,097
Less than 12 months Gross Unrealized Losses (1,274) (503)
Greater than 12 months Fair Value 105,405 45,085
Greater than 12 months Gross Unrealized Losses (2,174) (920)
Fair Value 228,884 119,182
Gross Unrealized Losses (3,448) (1,423)
Fixed Maturities | Agency Residential Mortgage-Backed Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 34,819 87,496
Less than 12 months Gross Unrealized Losses (814) (346)
Greater than 12 months Fair Value 270,997 236,745
Greater than 12 months Gross Unrealized Losses (12,304) (5,068)
Fair Value 305,816 324,241
Gross Unrealized Losses (13,118) (5,414)
Fixed Maturities | Residential Mortgage Backed Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 70,965 12,418
Less than 12 months Gross Unrealized Losses (249) (62)
Greater than 12 months Fair Value 10,110 546
Greater than 12 months Gross Unrealized Losses (281) (17)
Fair Value 81,075 12,964
Gross Unrealized Losses (530) (79)
Fixed Maturities | Asset-Backed Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 345,437 85,877
Less than 12 months Gross Unrealized Losses (6,950) (468)
Greater than 12 months Fair Value 77,362 24,733
Greater than 12 months Gross Unrealized Losses (1,090) (195)
Fair Value 422,799 110,610
Gross Unrealized Losses (8,040) (663)
Fixed Maturities | Commercial Mortgage-Backed Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 58,877 20,482
Less than 12 months Gross Unrealized Losses (282) (95)
Greater than 12 months Fair Value 41,477 22,903
Greater than 12 months Gross Unrealized Losses (2,534) (1,087)
Fair Value 100,354 43,385
Gross Unrealized Losses (2,816) (1,182)
Fixed Maturities | Mortgage-Backed and Asset-Backed Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value 510,098 206,273
Less than 12 months Gross Unrealized Losses (8,295) (971)
Greater than 12 months Fair Value 399,946 284,927
Greater than 12 months Gross Unrealized Losses (16,209) (6,367)
Fair Value 910,044 491,200
Gross Unrealized Losses (24,504) (7,338)
Fixed Maturities | Corporate Exposures    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value [1] 481,057 295,433
Less than 12 months Gross Unrealized Losses [1] (15,456) (1,690)
Greater than 12 months Fair Value [1] 300,113 121,410
Greater than 12 months Gross Unrealized Losses [1] (13,184) (2,047)
Fair Value [1] 781,170 416,843
Gross Unrealized Losses [1] $ (28,640) (3,737)
Equity Securities    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value   62,106
Less than 12 months Gross Unrealized Losses   (1,605)
Greater than 12 months Fair Value   2,432
Greater than 12 months Gross Unrealized Losses   (67)
Fair Value   64,538
Gross Unrealized Losses   (1,672)
Equity Securities | Common Stocks    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value   11,245
Less than 12 months Gross Unrealized Losses   (81)
Greater than 12 months Fair Value   1,770
Greater than 12 months Gross Unrealized Losses   (31)
Fair Value   13,015
Gross Unrealized Losses   (112)
Equity Securities | Preferred Stocks    
Gain (Loss) on Investments [Line Items]    
Less than 12 months Fair Value   50,861
Less than 12 months Gross Unrealized Losses   (1,524)
Greater than 12 months Fair Value   662
Greater than 12 months Gross Unrealized Losses   (36)
Fair Value   51,523
Gross Unrealized Losses   $ (1,560)
[1] Corporate Exposures consist of investments in corporate bonds, hybrid bonds and redeemable preferred stocks.