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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 650,575 | $ 489,846
Gross Unrealized Gains | 1,201 | 693
Gross Unrealized Losses | (11,610) | (7,221)
Fair Value | 640,166 | 483,318
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 5,000 | 25,011
Gross Unrealized Gains | 2 | 10
Fair Value | 5,002 | 25,021
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 74,937 | 126,209
Gross Unrealized Losses | (670) | (867)
Fair Value | 74,267 | 125,342
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 192,328 | 126,421
Gross Unrealized Gains | 402 | 137
Gross Unrealized Losses | (1,300) | (1,041)
Fair Value | 191,430 | 125,517
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 216,679 | 151,328
Fair Value | 214,776 | 150,160
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 216,679 | 151,328
Gross Unrealized Gains | 135 | 97
Gross Unrealized Losses | (2,038) | (1,265)
Fair Value | 214,776 | 150,160
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 94,794 |
Gross Unrealized Gains | 130 |
Gross Unrealized Losses | (3,727) |
Fair Value | 91,197 |
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 12,723 | 9,665
Gross Unrealized Gains | 125 | 429
Gross Unrealized Losses | (157) | (29)
Fair Value | 12,691 | 10,065
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 214 | 10,991
Gross Unrealized Gains |  | 15
Gross Unrealized Losses | (121) | (244)
Fair Value | 93 | 10,762
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 53,900 | 35,221
Gross Unrealized Gains | 407 | 5
Gross Unrealized Losses | (3,597) | (3,774)
Fair Value | $ 50,710 | 31,452
Other [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost |  | 5,000
Gross Unrealized Losses |  | (1)
Fair Value |  | $ 4,999

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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=65884222&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=73527792&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=66010992&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=73527792&loc=d3e27161-111563 + Details
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