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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 623,851 | $ 650,575
Gross Unrealized Gains | 2,635 | 1,201
Gross Unrealized Losses | (6,650) | (11,610)
Fair Value | 619,836 | 640,166
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 211,044 | 216,679
Fair Value | 209,768 | 214,776
Fixed Maturities [Member] | U.S. Government Obligations and Agencies [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 78,049 | 74,937
Gross Unrealized Gains | 35 |
Gross Unrealized Losses | (545) | (670)
Fair Value | 77,539 | 74,267
Fixed Maturities [Member] | Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 203,843 | 192,328
Gross Unrealized Gains | 1,018 | 402
Gross Unrealized Losses | (658) | (1,300)
Fair Value | 204,203 | 191,430
Fixed Maturities [Member] | Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 211,044 | 216,679
Gross Unrealized Gains | 116 | 135
Gross Unrealized Losses | (1,392) | (2,038)
Fair Value | 209,768 | 214,776
Fixed Maturities [Member] | Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 105,110 | 94,794
Gross Unrealized Gains | 638 | 130
Gross Unrealized Losses | (1,836) | (3,727)
Fair Value | 103,912 | 91,197
Fixed Maturities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 13,727 | 12,723
Gross Unrealized Gains | 769 | 125
Gross Unrealized Losses | (9) | (157)
Fair Value | 14,487 | 12,691
Equity Securities [Member] | Mutual Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 12,078 | 53,900
Gross Unrealized Gains | 59 | 407
Gross Unrealized Losses | (2,210) | (3,597)
Fair Value | $ 9,927 | 50,710
Equity Securities [Member] | Common Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost |  | 214
Gross Unrealized Losses |  | (121)
Fair Value |  | 93
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost |  | 5,000
Gross Unrealized Gains |  | 2
Fair Value |  | $ 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=75030427&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=82897076&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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