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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 543,513 | $ 426,568
Gross Unrealized Gains | 2,136 | 514
Gross Unrealized Losses | (6,230) | (3,501)
Fair Value | 539,419 | 423,581
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 75,022 | 50,000
Gross Unrealized Gains | 3 |
Gross Unrealized Losses | (2) | (10)
Fair Value | 75,023 | 49,990
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 135,774 | 120,627
Gross Unrealized Gains | 517 | 38
Gross Unrealized Losses | (201) | (627)
Fair Value | 136,090 | 120,038
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 128,357 | 120,025
Gross Unrealized Gains | 412 | 171
Gross Unrealized Losses | (649) | (364)
Fair Value | 128,120 | 119,832
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 138,482 | 107,589
Fair Value | 138,685 | 107,223
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 138,482 | 107,589
Gross Unrealized Gains | 527 | 136
Gross Unrealized Losses | (324) | (502)
Fair Value | 138,685 | 107,223
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 9,734 | 6,700
Gross Unrealized Gains | 201 | 165
Gross Unrealized Losses | (65) | (9)
Fair Value | 9,870 | 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 | 16,545 | 331
Gross Unrealized Gains | 472 | 4
Gross Unrealized Losses | (1,274) | (65)
Fair Value | 15,743 | 270
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 34,599 | 21,296
Gross Unrealized Losses | (3,715) | (1,924)
Fair Value | $ 30,884 | $ 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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