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Investments - Investment Holdings by Type of Instrument (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost $ 486,334 $ 474,927
Investment Owned, at Fair Value 485,904 474,315
Investment Owned, at Carrying Value 485,904 474,315
Cash and Cash Equivalents [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 122,771 117,275
Investment Owned, at Fair Value 122,771 117,275
Investment Owned, at Carrying Value 122,771 117,275
Restricted Cash and Cash Equivalents [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 2,635 2,600
Investment Owned, at Fair Value 2,635 2,600
Investment Owned, at Carrying Value 2,635 2,600
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 360,928 355,052
Investment Owned, at Fair Value 360,498 354,440
Investment Owned, at Carrying Value 360,498 354,440
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] | U.S. Government Obligations and Agencies [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 116,808 105,229
Investment Owned, at Fair Value 115,961 104,215
Investment Owned, at Carrying Value 115,961 104,215
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] | Corporate Bonds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 94,086 94,708
Investment Owned, at Fair Value 93,831 94,203
Investment Owned, at Carrying Value 93,831 94,203
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 90,953 91,502
Investment Owned, at Fair Value 90,554 91,000
Investment Owned, at Carrying Value 90,554 91,000
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] | Common Stock [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 7,024 8,500
Investment Owned, at Fair Value 7,250 9,295
Investment Owned, at Carrying Value 7,250 9,295
Categories of Investments, Marketable Securities, Available-for-Sale Securities [Member] | Mutual Funds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 52,057 55,113
Investment Owned, at Fair Value 52,902 55,727
Investment Owned, at Carrying Value $ 52,902 $ 55,727