Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Outstanding debt	$ 320,643	$ 296,703
Less: unamortized debt issuance costs	1,230	659
Long-term debt, including current maturities	319,413	296,044
Less: current maturities	10,265	174,760
Long-term debt, noncurrent	309,148	121,284
3.3% Term Loan A due June 2024
Debt Instrument [Line Items]
Outstanding debt	197,500	0
8% Unsecured Notes due December 2019
Debt Instrument [Line Items]
Outstanding debt	0	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	$ 6,263	$ 6,245
Parent company \| 3.3% Term Loan A due June 2024
Debt Instrument [Line Items]
Notes interest rate	3.30%
Parent company \| 8% Unsecured Notes due December 2019
Debt Instrument [Line Items]
Notes interest rate	8.00%
Parent company \| 7.625% Unsecured Notes due March 2027
Debt Instrument [Line Items]
Notes interest rate	7.625%

Long term debt current excluding notes payable current.

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-SubTopic 210
-Section S99
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-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- 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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- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of long-term debt and lease obligation, including portion classified as current.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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