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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Security
Dec. 31, 2013
Security
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 34 95
Less than 12 months, Fair value $ 53,225 $ 227,241
Less than 12 months, Unrealized losses (314) (4,153)
12 months or longer, Number of issues 29   
12 months or longer, Fair value 81,585   
12 months or longer, Unrealized losses (1,528)   
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 2 6
Less than 12 months, Fair value 17,604 71,042
Less than 12 months, Unrealized losses (79) (1,033)
12 months or longer, Number of issues 4   
12 months or longer, Fair value 34,152   
12 months or longer, Unrealized losses (507)   
Corporate Bonds [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 9 55
Less than 12 months, Fair value 5,954 65,926
Less than 12 months, Unrealized losses (28) (770)
12 months or longer, Number of issues 14   
12 months or longer, Fair value 17,905   
12 months or longer, Unrealized losses (120)   
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 8 16
Less than 12 months, Fair value 27,200 67,110
Less than 12 months, Unrealized losses (106) (577)
12 months or longer, Number of issues 5   
12 months or longer, Fair value 19,175   
12 months or longer, Unrealized losses (244)   
Redeemable Preferred Stock [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 9  
Less than 12 months, Fair value 1,080  
Less than 12 months, Unrealized losses (2)  
Common Stock [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 5 13
Less than 12 months, Fair value 228 3,517
Less than 12 months, Unrealized losses (23) (121)
12 months or longer, Number of issues 5   
12 months or longer, Fair value 282   
12 months or longer, Unrealized losses (42)   
Mutual Funds [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Number of issues 1 5
Less than 12 months, Fair value 1,159 19,646
Less than 12 months, Unrealized losses (76) (1,652)
12 months or longer, Number of issues 1   
12 months or longer, Fair value 10,071   
12 months or longer, Unrealized losses $ (615)