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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 534,153 | $ 489,846
Gross Unrealized Gains | 3,570 | 693
Gross Unrealized Losses | (4,739) | (7,221)
Fair Value | 532,984 | 483,318
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 12,504 | 25,011
Gross Unrealized Gains | 1 | 10
Fair Value | 12,505 | 25,021
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 131,110 | 126,209
Gross Unrealized Gains | 904 |
Gross Unrealized Losses | (91) | (867)
Fair Value | 131,923 | 125,342
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 157,358 | 126,421
Gross Unrealized Gains | 1,410 | 137
Gross Unrealized Losses | (445) | (1,041)
Fair Value | 158,323 | 125,517
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 183,108 | 151,328
Fair Value | 183,522 | 150,160
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 183,108 | 151,328
Gross Unrealized Gains | 794 | 97
Gross Unrealized Losses | (380) | (1,265)
Fair Value | 183,522 | 150,160
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 9,518 | 9,665
Gross Unrealized Gains | 444 | 429
Gross Unrealized Losses | (11) | (29)
Fair Value | 9,951 | 10,065
Other [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 5,000 | 5,000
Gross Unrealized Gains | 6 |
Gross Unrealized Losses |  | (1)
Fair Value | 5,006 | 4,999
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 215 | 10,991
Gross Unrealized Gains |  | 15
Gross Unrealized Losses | (96) | (244)
Fair Value | 119 | 10,762
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 35,340 | 35,221
Gross Unrealized Gains | 11 | 5
Gross Unrealized Losses | (3,716) | (3,774)
Fair Value | $ 31,635 | $ 31,452

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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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