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Debt - Additional Information (Detail) - Surplus Note	Dec. 31, 2006 USD ($)
Debt Instrument [Line Items]
Unsecured term loan agreement	$ 25,000,000
Note term	20 years

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

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Balance Type:	na
Period Type:	duration

X

- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: