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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 659,383 | $ 650,575
Gross Unrealized Gains | 2,641 | 1,201
Gross Unrealized Losses | (9,062) | (11,610)
Fair Value | 652,962 | 640,166
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 215,670 | 216,679
Fair Value | 214,001 | 214,776
Fixed Maturities [Member] | U.S. Government Obligations and Agencies [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 78,055 | 74,937
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (587) | (670)
Fair Value | 77,469 | 74,267
Fixed Maturities [Member] | Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 194,289 | 192,328
Gross Unrealized Gains | 727 | 402
Gross Unrealized Losses | (975) | (1,300)
Fair Value | 194,041 | 191,430
Fixed Maturities [Member] | Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 215,670 | 216,679
Gross Unrealized Gains | 128 | 135
Gross Unrealized Losses | (1,797) | (2,038)
Fair Value | 214,001 | 214,776
Fixed Maturities [Member] | Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 100,762 | 94,794
Gross Unrealized Gains | 307 | 130
Gross Unrealized Losses | (3,177) | (3,727)
Fair Value | 97,892 | 91,197
Fixed Maturities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 13,777 | 12,723
Gross Unrealized Gains | 524 | 125
Gross Unrealized Losses | (29) | (157)
Fair Value | 14,272 | 12,691
Equity Securities [Member] | Common Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 214 | 214
Gross Unrealized Losses | (119) | (121)
Fair Value | 95 | 93
Equity Securities [Member] | Mutual Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 51,616 | 53,900
Gross Unrealized Gains | 953 | 407
Gross Unrealized Losses | (2,378) | (3,597)
Fair Value | 50,191 | 50,710
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 5,000 | 5,000
Gross Unrealized Gains | 1 | 2
Fair Value | $ 5,001 | $ 5,002

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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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