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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 360,928 $ 355,052
Gross Unrealized Gains 3,000 3,541
Gross Unrealized Losses (3,430) (4,153)
Fair Value 360,498 354,440
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 116,808 105,229
Gross Unrealized Gains 39 19
Gross Unrealized Losses (886) (1,033)
Fair Value 115,961 104,215
Corporate Bonds [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 94,086 94,708
Gross Unrealized Gains 190 265
Gross Unrealized Losses (445) (770)
Fair Value 93,831 94,203
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 90,953 91,502
Gross Unrealized Gains 126 75
Gross Unrealized Losses (525) (577)
Fair Value 90,554 91,000
Common Stock [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 7,024 8,500
Gross Unrealized Gains 439 916
Gross Unrealized Losses (213) (121)
Fair Value 7,250 9,295
Mutual Funds [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 52,057 55,113
Gross Unrealized Gains 2,206 2,266
Gross Unrealized Losses (1,361) (1,652)
Fair Value $ 52,902 $ 55,727