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Investments - Investment Holdings by Type of Instrument (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost $ 565,338 $ 474,927
Investment Owned, at Fair Value 562,819 474,315
Investment Owned, at Carrying Value 562,819 474,315
Cash and Cash Equivalents [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 170,352 117,275
Investment Owned, at Fair Value 170,352 117,275
Investment Owned, at Carrying Value 170,352 117,275
Restricted Cash and Cash Equivalents [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 6,597 2,600
Investment Owned, at Fair Value 6,597 2,600
Investment Owned, at Carrying Value 6,597 2,600
U.S. Government Obligations and Agencies [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 116,903 105,229
Investment Owned, at Fair Value 116,083 104,215
Investment Owned, at Carrying Value 116,083 104,215
Corporate Bonds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 109,946 94,708
Investment Owned, at Fair Value 109,837 94,203
Investment Owned, at Carrying Value 109,837 94,203
Mortgage-Backed and Asset-Backed Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 95,599 91,502
Investment Owned, at Fair Value 95,238 91,000
Investment Owned, at Carrying Value 95,238 91,000
Redeemable Preferred Stock [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 6,813  
Investment Owned, at Fair Value 6,852  
Investment Owned, at Carrying Value 6,852  
Common Stock [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 331 8,500
Investment Owned, at Fair Value 250 9,295
Investment Owned, at Carrying Value 250 9,295
Mutual Funds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 21,297 55,113
Investment Owned, at Fair Value 20,137 55,727
Investment Owned, at Carrying Value 20,137 55,727
Short-term Investments [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 37,500  
Investment Owned, at Fair Value 37,473  
Investment Owned, at Carrying Value 37,473  
Available For Sale Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 388,389 355,052
Investment Owned, at Fair Value 385,870 354,440
Investment Owned, at Carrying Value $ 385,870 $ 354,440