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Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Sep. 30, 2013 | Dec. 31, 2011 | Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity |  | 3.00% |  |  |  |  |
Deferred policy acquisition costs |  | $ 16,953,000 |  | $ 17,241,000 | $ 17,282,000 | $ 18,019,000 | $ 17,744,000
Deferred policy acquisition costs, net, difference percentage |  |  | 13.00% |  |  |  |
Deferred policy acquisition costs, pre-tax charge against earnings | 1,600,000 |  |  |  |  |  |
Maximum amortization period for capitalized cost |  | 12 months |  |  |  |  |
Acquisition-Related Costs [Member] | Minimum [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 11,400,000 |  |  |  |
Acquisition-Related Costs [Member] | Maximum [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | $ 13,000,000 |  |  |  |

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- Definition The unamortized portion as of the balance sheet date of capitalized acquisition costs that are related directly to the successful acquisition of new and renewal insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6968122&loc=d3e11446-158418 + Details
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- Definition Deferred policy acquisition costs net difference amount. + References No definition available. + Details
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- Details
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- Definition Unsecured amounts due from reinsurers exceeding fixed percentage of stockholders equity. + References No definition available. + Details
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