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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Security
Dec. 31, 2013
Security
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 84 95
Less than 12 months, Fair value $ 211,143 $ 227,241
Less than 12 months, Unrealized losses (3,430) (4,153)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses      
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 7 6
Less than 12 months, Fair value 82,798 71,042
Less than 12 months, Unrealized losses (886) (1,033)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses      
Corporate Bonds [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 42 55
Less than 12 months, Fair value 47,773 65,926
Less than 12 months, Unrealized losses (445) (770)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses      
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 17 16
Less than 12 months, Fair value 60,261 67,110
Less than 12 months, Unrealized losses (525) (577)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses      
Common Stock [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 14 13
Less than 12 months, Fair value 2,314 3,517
Less than 12 months, Unrealized losses (213) (121)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses      
Mutual Funds [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 4 5
Less than 12 months, Fair value 17,997 19,646
Less than 12 months, Unrealized losses (1,361) (1,652)
12 months or longer, Number of issues      
12 months or longer, Fair value      
12 months or longer, Unrealized losses