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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail)
$ in Thousands
Jun. 30, 2015
USD ($)
Security
Dec. 31, 2014
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 200 108
Less than 12 months, Fair value $ 178,180 $ 183,191
Less than 12 months, Unrealized losses $ (1,183) $ (702)
12 months or longer, Number of issues | Security 14 24
12 months or longer, Fair value $ 30,574 $ 74,973
12 months or longer, Unrealized losses $ (2,484) $ (2,799)
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 | Security 2 3
Less than 12 months, Fair value $ 18,934 $ 27,341
Less than 12 months, Unrealized losses $ (101) $ (55)
12 months or longer, Number of issues | Security 2 4
12 months or longer, Fair value $ 3,509 $ 34,050
12 months or longer, Unrealized losses $ (133) $ (572)
Corporate Bonds [Member] | Fixed Maturities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 63 67
Less than 12 months, Fair value $ 55,005 $ 58,271
Less than 12 months, Unrealized losses $ (244) $ (238)
12 months or longer, Number of issues | Security 4 12
12 months or longer, Fair value $ 3,575 $ 15,105
12 months or longer, Unrealized losses $ (32) $ (126)
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 | Security 19 20
Less than 12 months, Fair value $ 40,672 $ 48,335
Less than 12 months, Unrealized losses $ (256) $ (273)
12 months or longer, Number of issues | Security 5 5
12 months or longer, Fair value $ 14,684 $ 16,842
12 months or longer, Unrealized losses $ (280) $ (229)
Redeemable Preferred Stock [Member] | Fixed Maturities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 33 12
Less than 12 months, Fair value $ 3,936 $ 1,153
Less than 12 months, Unrealized losses $ (85) $ (9)
Common Stock [Member] | Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 4 2
Less than 12 months, Fair value $ 6,189 $ 87
Less than 12 months, Unrealized losses $ (245) $ (20)
12 months or longer, Number of issues | Security 2 2
12 months or longer, Fair value $ 92 $ 117
12 months or longer, Unrealized losses $ (66) $ (45)
Mutual Funds [Member] | Equity Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 3 2
Less than 12 months, Fair value $ 13,434 $ 10,514
Less than 12 months, Unrealized losses $ (232) $ (97)
12 months or longer, Number of issues | Security 1 1
12 months or longer, Fair value $ 8,714 $ 8,859
12 months or longer, Unrealized losses $ (1,973) $ (1,827)
Short-term Investments [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Less than 12 months, Number of issues | Security 76 2
Less than 12 months, Fair value $ 40,010 $ 37,490
Less than 12 months, Unrealized losses $ (20) $ (10)