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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 500,930 | $ 426,568
Gross Unrealized Gains | 866 | 514
Gross Unrealized Losses | (3,667) | (3,501)
Fair Value | 498,129 | 423,581
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 100,033 | 50,000
Gross Unrealized Gains | 12 |
Gross Unrealized Losses | (20) | (10)
Fair Value | 100,025 | 49,990
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 99,290 | 120,627
Gross Unrealized Gains | 71 | 38
Gross Unrealized Losses | (234) | (627)
Fair Value | 99,127 | 120,038
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 126,662 | 120,025
Gross Unrealized Gains | 263 | 171
Gross Unrealized Losses | (276) | (364)
Fair Value | 126,649 | 119,832
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 119,296 | 107,589
Fair Value | 119,088 | 107,223
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 119,296 | 107,589
Gross Unrealized Gains | 328 | 136
Gross Unrealized Losses | (536) | (502)
Fair Value | 119,088 | 107,223
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 9,650 | 6,700
Gross Unrealized Gains | 156 | 165
Gross Unrealized Losses | (85) | (9)
Fair Value | 9,721 | 6,856
Other [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 5,000 |
Gross Unrealized Gains | 4 |
Fair Value | 5,004 |
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 6,617 | 331
Gross Unrealized Gains | 2 | 4
Gross Unrealized Losses | (311) | (65)
Fair Value | 6,308 | 270
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 34,382 | 21,296
Gross Unrealized Gains | 30 |
Gross Unrealized Losses | (2,205) | (1,924)
Fair Value | $ 32,207 | $ 19,372

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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