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Outstanding Debt Consisted (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt		$ 292,144	$ 174,673
Margin borrowing facilities
Debt Instrument [Line Items]
Debt		195,787	$ 174,673
7.75% Subordinated Notes due 2045
Debt Instrument [Line Items]
Debt	[1]	$ 96,357
[1] As of September 30, 2015, the carrying value and fair value of the 7.75% Subordinated Notes due 2045 are net of unamortized debt issuance cost of $3.6 million.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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)



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-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



-Paragraph 1



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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-Number 210



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