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Investments - Investment Holdings by Type of Instrument (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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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

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