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Summary of Securities with Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value $ 488,777 $ 453,042
Less than 12 months, Gross Unrealized Losses (5,062) (5,160) [1]
12 months or longer, Fair Value 43,132 [1] 115,363
12 months or longer, Gross Unrealized Losses [1] (484) (1,739)
Total, Fair Value 531,909 568,405
Total, Gross Unrealized Losses (5,546) (6,899)
U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Gross Unrealized Losses (1)  
Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (850)  
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (480)  
Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (614)  
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (463)  
Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross Unrealized Losses (625)  
Common Shares    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 32,507 20,002
Less than 12 months, Gross Unrealized Losses (2,277) (2,808) [1]
12 months or longer, Fair Value   1,577
12 months or longer, Gross Unrealized Losses [1]   (130)
Total, Fair Value 32,507 21,579
Total, Gross Unrealized Losses (2,277) (2,938)
Fixed Maturities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 456,270 433,040
Less than 12 months, Gross Unrealized Losses (2,785) (2,352) [1]
12 months or longer, Fair Value 43,132 [1] 113,786
12 months or longer, Gross Unrealized Losses [1] (484) (1,609)
Total, Fair Value 499,402 546,826
Total, Gross Unrealized Losses (3,269) (3,961)
Fixed Maturities | U.S. Treasury and Agency Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 504 11,728
Less than 12 months, Gross Unrealized Losses [1]   (9)
12 months or longer, Fair Value 3,376 [1] 3,343
12 months or longer, Gross Unrealized Losses [1] (44) (74)
Total, Fair Value 3,880 15,071
Total, Gross Unrealized Losses (44) (83)
Fixed Maturities | Obligations of States and Political Subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 41,091 28,684
Less than 12 months, Gross Unrealized Losses (716) (314) [1]
12 months or longer, Fair Value 10,266 [1] 28,061
12 months or longer, Gross Unrealized Losses [1] (134) (383)
Total, Fair Value 51,357 56,745
Total, Gross Unrealized Losses (850) (697)
Fixed Maturities | Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 62,327 2,818
Less than 12 months, Gross Unrealized Losses (357) (7) [1]
12 months or longer, Fair Value 11,650 [1] 51,203
12 months or longer, Gross Unrealized Losses [1] (123) (757)
Total, Fair Value 73,977 54,021
Total, Gross Unrealized Losses (480) (764)
Fixed Maturities | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 62,664 92,123
Less than 12 months, Gross Unrealized Losses (193) (283) [1]
12 months or longer, Fair Value   1,683
12 months or longer, Gross Unrealized Losses [1]   (20)
Total, Fair Value 62,664 93,806
Total, Gross Unrealized Losses (193) (303)
Fixed Maturities | Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 96,171 92,664
Less than 12 months, Gross Unrealized Losses (448) (525) [1]
12 months or longer, Fair Value 14,862 [1] 26,280
12 months or longer, Gross Unrealized Losses [1] (166) (322)
Total, Fair Value 111,033 118,944
Total, Gross Unrealized Losses (614) (847)
Fixed Maturities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 130,759 144,505
Less than 12 months, Gross Unrealized Losses (446) (656) [1]
12 months or longer, Fair Value 2,978 [1] 3,216
12 months or longer, Gross Unrealized Losses [1] (17) (53)
Total, Fair Value 133,737 147,721
Total, Gross Unrealized Losses (463) (709)
Fixed Maturities | Foreign Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 62,754 60,518
Less than 12 months, Gross Unrealized Losses (625) (558) [1]
Total, Fair Value 62,754 60,518
Total, Gross Unrealized Losses $ (625) $ (558)
[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.