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Reinsurance - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Reinsurers	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Reinsurers	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Reinsurers
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Number of reinsurers | Reinsurers	21		21		28
Reinsurance recoverable	$ 0		$ 0		$ 0
Credit risk associated with reinsurance receivables	0		0		0
Recoveries pertaining to reinsurance contracts	0	$ 0	0	$ 0
Net reduction in ceded premiums	6,241,000	$ 5,056,000	12,614,000	$ 10,540,000
Other assets	48,151,000		48,151,000		35,587,000
Prepaid reinsurance premiums	33,418,000		33,418,000		34,096,000
Reinsurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Other assets	41,503,000		41,503,000		28,596,000
Prepaid reinsurance premiums	$ 5,691,000		$ 5,691,000		$ 5,983,000

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- Definition

Concentration of credit risk associated with reinsurance receivables.

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- Definition

Net reduction to ceded premium resulting from reinsurance adjustments.

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- Definition

Number of reinsurers participating in the company's reinsurance program.

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ 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 210.5-02.17)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 10



-Article 7

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- Definition

The unexpired portion of premiums ceded on policies in force as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Prepaid Reinsurance Premiums



-URI http://asc.fasb.org/extlink&oid=6521719



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 340



-Section 25



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507

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Amount of recovery (expense) related to provision for policy benefits and costs incurred for policies assumed and ceded.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 40



-Section 50



-Paragraph 3



-Subparagraph (a)



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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-Publisher FASB



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-Topic 944



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-Paragraph 5



-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387



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