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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Security
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Number of issues 95
Less than 12 months, Fair value $ 227,241
Less than 12 months, Unrealized losses (4,153)
12 months or longer, Number of issues   
12 months or longer, Fair value   
12 months or longer, Unrealized losses   
US Government and Agency Obligations [Member] | Fixed Maturities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Number of issues 6
Less than 12 months, Fair value 71,042
Less than 12 months, Unrealized losses (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 55
Less than 12 months, Fair value 65,926
Less than 12 months, Unrealized losses (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 16
Less than 12 months, Fair value 67,110
Less than 12 months, Unrealized losses (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 13
Less than 12 months, Fair value 3,517
Less than 12 months, Unrealized losses (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 5
Less than 12 months, Fair value 19,646
Less than 12 months, Unrealized losses (1,652)
12 months or longer, Number of issues   
12 months or longer, Fair value   
12 months or longer, Unrealized losses