Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Outstanding debt	$ 298,142	$ 300,341
Less: unamortized debt issuance costs	742	826
Long-term debt, including current maturities	297,400	299,515
Less: current maturities	1,413	2,421
Long-term debt, noncurrent	295,987	297,094
8% unsecured notes due December 2019
Debt Instrument [Line Items]
Outstanding debt	173,578	173,578
7.625% unsecured notes due March 2027
Debt Instrument [Line Items]
Outstanding debt	116,880	116,880
Capitalized leases and other
Debt Instrument [Line Items]
Outstanding debt	$ 7,684	$ 9,883
Parent company \| 8% unsecured notes due December 2019
Debt Instrument [Line Items]
Notes interest rate (as a percent)	8.00%
Parent company \| 7.625% unsecured notes due March 2027
Debt Instrument [Line Items]
Notes interest rate (as a percent)	7.625%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: 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))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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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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