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Amounts Recorded for Margin Borrowing Facilities and 7.75% Subordinated Notes (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Outstanding Principal		$ 295,787	$ 174,673
Unamortized Debt Issuance Costs		(3,643)
Net Carrying Amount		292,144	174,673
Margin borrowing facilities
Debt Instrument [Line Items]
Outstanding Principal		195,787	174,673
Net Carrying Amount		195,787	$ 174,673
7.75% Subordinated Notes due 2045
Debt Instrument [Line Items]
Outstanding Principal		100,000
Unamortized Debt Issuance Costs		(3,643)
Net Carrying Amount	[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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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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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.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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