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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Amortized Cost (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value $ 625,783 $ 561,179
States and Political Subdivisions [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 395,927 399,155
Corporate Bonds [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 145,273 68,243
Commercial Mortgage-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 50,028 54,244
U.S. Agency-Based Mortgage-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 19,747 23,565
US Treasury Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 11,718 6,602
Obligations of U.S. Government Agencies [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value   5,914
Asset-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 3,090 3,456
Fair Value, Inputs, Level 1 [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 11,718 6,602
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 11,718 6,602
Fair Value, Inputs, Level 2 [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 614,065 554,577
Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 395,927 399,155
Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 145,273 68,243
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 50,028 54,244
Fair Value, Inputs, Level 2 [Member] | U.S. Agency-Based Mortgage-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value 19,747 23,565
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. Government Agencies [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value   5,914
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member]
    
Fair Value Measurements Disclosure [Line Items]    
Securities held-to-maturity-fixed maturity, Fair Value $ 3,090 $ 3,456