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Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months $ (3,069) $ (1,961)
Fair Value, Less than Twelve Months 116,372 41,010
Gross Unrealized Loss, Twelve Months or Greater (92) (103)
Fair Value, Twelve Months or Greater 2,410 5,819
Gross Unrealized Loss, Total (3,161) (2,064)
Fair Value, Total 118,782 46,829
Fixed-Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (1,542) (512)
Fair Value, Less than Twelve Months 91,658 22,162
Gross Unrealized Loss, Twelve Months or Greater (66) (21)
Fair Value, Twelve Months or Greater 1,576 1,200
Gross Unrealized Loss, Total (1,608) (533)
Fair Value, Total 93,234 23,362
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (9) (8)
Fair Value, Less than Twelve Months 3,224 2,485
Gross Unrealized Loss, Total (9) (8)
Fair Value, Total 3,224 2,485
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (789) (428)
Fair Value, Less than Twelve Months 33,325 12,720
Gross Unrealized Loss, Twelve Months or Greater (18) (2)
Fair Value, Twelve Months or Greater 982 998
Gross Unrealized Loss, Total (807) (430)
Fair Value, Total 34,307 13,718
Fixed-Maturity Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (3)  
Fair Value, Less than Twelve Months 1,234 209
Gross Unrealized Loss, Total (3)  
Fair Value, Total 1,234 209
Fixed-Maturity Securities [Member] | Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (95) (3)
Fair Value, Less than Twelve Months 10,365 1,018
Gross Unrealized Loss, Total (95) (3)
Fair Value, Total 10,365 1,018
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (609) (19)
Fair Value, Less than Twelve Months 40,529 3,144
Gross Unrealized Loss, Twelve Months or Greater (48) (19)
Fair Value, Twelve Months or Greater 594 202
Gross Unrealized Loss, Total (657) (38)
Fair Value, Total 41,123 3,346
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (37) (54)
Fair Value, Less than Twelve Months 2,981 2,586
Gross Unrealized Loss, Total (37) (54)
Fair Value, Total 2,981 2,586
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (1,527) (1,449)
Fair Value, Less than Twelve Months 24,714 18,848
Gross Unrealized Loss, Twelve Months or Greater (26) (82)
Fair Value, Twelve Months or Greater 834 4,619
Gross Unrealized Loss, Total (1,553) (1,531)
Fair Value, Total $ 25,548 $ 23,467