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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value   $ 655,942
Less than 12 months, Gross Unrealized Losses   (7,571)
12 months or longer, Fair Value [1]   139,400
12 months or longer, Gross Unrealized Losses [1]   (1,843)
Total, Fair Value   795,342
Total, Gross Unrealized Losses   (9,414)
U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses $ (2,060)  
Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (601)  
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (3,511)  
Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (1,204)  
Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (3,554)  
Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (7,424)  
Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (2,296)  
Common Shares    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value   32,759
Less than 12 months, Gross Unrealized Losses   (3,260)
Total, Fair Value   32,759
Total, Gross Unrealized Losses   (3,260)
Fixed Maturities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 958,211 623,183
Less than 12 months, Gross Unrealized Losses (18,024) (4,311)
12 months or longer, Fair Value [1] 132,136 139,400
12 months or longer, Gross Unrealized Losses [1] (2,626) (1,843)
Total, Fair Value 1,090,347 762,583
Total, Gross Unrealized Losses (20,650) (6,154)
Fixed Maturities | U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 69,992 79,403
Less than 12 months, Gross Unrealized Losses (1,813) (962)
12 months or longer, Fair Value [1] 20,223 17,469
12 months or longer, Gross Unrealized Losses [1] (247) (231)
Total, Fair Value 90,215 96,872
Total, Gross Unrealized Losses (2,060) (1,193)
Fixed Maturities | Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 46,524 34,537
Less than 12 months, Gross Unrealized Losses (454) (149)
12 months or longer, Fair Value [1] 7,711 12,060
12 months or longer, Gross Unrealized Losses [1] (147) (125)
Total, Fair Value 54,235 46,597
Total, Gross Unrealized Losses (601) (274)
Fixed Maturities | Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 165,295 127,991
Less than 12 months, Gross Unrealized Losses (3,453) (1,247)
12 months or longer, Fair Value [1] 1,756 1,866
12 months or longer, Gross Unrealized Losses [1] (58) (44)
Total, Fair Value 167,051 129,857
Total, Gross Unrealized Losses (3,511) (1,291)
Fixed Maturities | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 148,609 97,817
Less than 12 months, Gross Unrealized Losses (1,158) (371)
12 months or longer, Fair Value [1] 6,399 6,423
12 months or longer, Gross Unrealized Losses [1] (46) (22)
Total, Fair Value 155,008 104,240
Total, Gross Unrealized Losses (1,204) (393)
Fixed Maturities | Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 113,728 83,051
Less than 12 months, Gross Unrealized Losses (2,766) (523)
12 months or longer, Fair Value [1] 27,292 27,976
12 months or longer, Gross Unrealized Losses [1] (788) (544)
Total, Fair Value 141,020 111,027
Total, Gross Unrealized Losses (3,554) (1,067)
Fixed Maturities | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 320,235 147,064
Less than 12 months, Gross Unrealized Losses (6,429) (754)
12 months or longer, Fair Value [1] 52,303 53,024
12 months or longer, Gross Unrealized Losses [1] (995) (637)
Total, Fair Value 372,538 200,088
Total, Gross Unrealized Losses (7,424) (1,391)
Fixed Maturities | Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 93,828 53,320
Less than 12 months, Gross Unrealized Losses (1,951) (305)
12 months or longer, Fair Value [1] 16,452 20,582
12 months or longer, Gross Unrealized Losses [1] (345) (240)
Total, Fair Value 110,280 73,902
Total, Gross Unrealized Losses $ (2,296) $ (545)
[1] Fixed maturities in a gross unrealized loss position for twelve months or longer are primarily comprised of non-credit losses on investment grade securities where management does not intend to sell, and it is more likely than not that the Company will not be forced to sell the security before recovery. The Company has analyzed these securities and has determined that they are not other than temporarily impaired.