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Long-Term Debt (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Scheduled principal payments on debt in 2014 | $ 2,000,000 | $ 2,000,000 |
Scheduled principal payments on debt in 2015 | 14,000,000 | 14,000,000 |
Scheduled principal payments on debt in 2016 | 45,000,000 | 45,000,000 |
Scheduled principal payments on debt in 2017 | 12,000,000 | 12,000,000 |
Scheduled principal payments on debt in 2018 | 0 | 0 |
Scheduled principal payments on debt in 2019 | 350,000,000 | 350,000,000 |
AFG [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit line | 500,000,000 | 500,000,000 |
Interest rate on revolving debt facility | 1.375% |  |
Amount borrowed under AFG revolving credit facility | 0 | 0 | 0
Interest rate description for revolving credit facility |  | 1.00% to 1.875% (currently 1.375%) over LIBOR |
AFG [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on revolving debt facility | 1.00% |  |
AFG [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on revolving debt facility | 1.875% |  |
National Interstate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit line | 100,000,000 | 100,000,000 |
Interest rate on revolving debt facility | 1.07% |  |
Loans payable under National Interstate bank credit facility | $ 12,000,000 | $ 12,000,000 |
Interest rate description for revolving credit facility |  | two-month LIBOR plus 0.875% (currently 1.07%) |
National Interstate [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on revolving debt facility | 0.875% |  |
9-7/8% Senior Notes due June 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate, percentage | 9.875% | 9.875% |
6-3/8% Senior Notes due June 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate, percentage | 6.375% | 6.375% |
5-3/4% Senior Notes due August 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate, percentage | 5.75% | 5.75% |
7% Senior Notes due September 2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate, percentage | 7.00% | 7.00% |

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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the sixth fiscal year following the latest fiscal year ended. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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