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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Security
Dec. 31, 2013
Security
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues 90 95
Less than 12 months, Fair value $ 126,496 $ 227,241
Less than 12 months, Unrealized losses (682) (4,153)
12 months or longer, Number of issues 27 0
12 months or longer, Fair value 84,729 0
12 months or longer, Unrealized losses (2,330) 0
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 17,473 71,042
Less than 12 months, Unrealized losses (152) (1,033)
12 months or longer, Number of issues 4 0
12 months or longer, Fair value 33,950 0
12 months or longer, Unrealized losses (732) 0
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 35,635 65,926
Less than 12 months, Unrealized losses (153) (770)
12 months or longer, Number of issues 13 0
12 months or longer, Fair value 16,301 0
12 months or longer, Unrealized losses (172) 0
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 14 16
Less than 12 months, Fair value 35,116 67,110
Less than 12 months, Unrealized losses (221) (577)
12 months or longer, Number of issues 7 0
12 months or longer, Fair value 24,775 0
12 months or longer, Unrealized losses (281) 0
Redeemable Preferred Stock [Member] | Fixed Maturities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues 26  
Less than 12 months, Fair value 2,681  
Less than 12 months, Unrealized losses (32)  
12 months or longer, Number of issues 0  
12 months or longer, Fair value 0  
12 months or longer, Unrealized losses 0  
Common Stock [Member] | Equity Securities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues 3 13
Less than 12 months, Fair value 131 3,517
Less than 12 months, Unrealized losses (27) (121)
12 months or longer, Number of issues 2 0
12 months or longer, Fair value 107 0
12 months or longer, Unrealized losses (55) 0
Mutual Funds [Member] | Equity Securities [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues 2 5
Less than 12 months, Fair value 10,487 19,646
Less than 12 months, Unrealized losses (70) (1,652)
12 months or longer, Number of issues 1 0
12 months or longer, Fair value 9,596 0
12 months or longer, Unrealized losses (1,090) 0
Short-term Investments [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues 1  
Less than 12 months, Fair value 24,973  
Less than 12 months, Unrealized losses (27)  
12 months or longer, Number of issues 0  
12 months or longer, Fair value 0  
12 months or longer, Unrealized losses $ 0