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Investments - Investment Holdings by Type of Instrument (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost $ 540,571 $ 474,927
Investment Owned, at Fair Value 539,557 474,315
Investment Owned, at Carrying Value 539,557 474,315
Cash and Cash Equivalents [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 201,357 117,275
Investment Owned, at Fair Value 201,357 117,275
Investment Owned, at Carrying Value 201,357 117,275
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
U.S. Government Obligations and Agencies [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 116,931 105,229
Investment Owned, at Fair Value 116,422 104,215
Investment Owned, at Carrying Value 116,422 104,215
Corporate Bonds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 106,450 94,708
Investment Owned, at Fair Value 106,745 94,203
Investment Owned, at Carrying Value 106,745 94,203
Mortgage-Backed and Asset-Backed Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 95,054 91,502
Investment Owned, at Fair Value 94,908 91,000
Investment Owned, at Carrying Value 94,908 91,000
Redeemable Preferred Stock [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 4,990  
Investment Owned, at Fair Value 5,070  
Investment Owned, at Carrying Value 5,070  
Common Stock [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 652 8,500
Investment Owned, at Fair Value 590 9,295
Investment Owned, at Carrying Value 590 9,295
Mutual Funds [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 12,502 55,113
Investment Owned, at Fair Value 11,830 55,727
Investment Owned, at Carrying Value 11,830 55,727
Available For Sale Securities [Member]
    
Investment Holdings [Line Items]    
Investment Owned, at Cost or Amortized Cost 336,579 355,052
Investment Owned, at Fair Value 335,565 354,440
Investment Owned, at Carrying Value $ 335,565 $ 354,440