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

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 + Details
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