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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 360,928 | $ 355,052
Gross Unrealized Gains | 3,000 | 3,541
Gross Unrealized Losses | (3,430) | (4,153)
Fair Value | 360,498 | 354,440
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 116,808 | 105,229
Gross Unrealized Gains | 39 | 19
Gross Unrealized Losses | (886) | (1,033)
Fair Value | 115,961 | 104,215
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 94,086 | 94,708
Gross Unrealized Gains | 190 | 265
Gross Unrealized Losses | (445) | (770)
Fair Value | 93,831 | 94,203
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 90,953 | 91,502
Gross Unrealized Gains | 126 | 75
Gross Unrealized Losses | (525) | (577)
Fair Value | 90,554 | 91,000
Common Stock [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 7,024 | 8,500
Gross Unrealized Gains | 439 | 916
Gross Unrealized Losses | (213) | (121)
Fair Value | 7,250 | 9,295
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or Amortized Cost | 52,057 | 55,113
Gross Unrealized Gains | 2,206 | 2,266
Gross Unrealized Losses | (1,361) | (1,652)
Fair Value | $ 52,902 | $ 55,727

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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=28360136&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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