DEBT (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
DebtInstrumentLineItems
Current portion of long-term debt and short-term debt	$ 1,259	$ 1,069
Long-term debt	953,083	953,279
Carrying Reported Amount Fair Value Disclosure [Member]
DebtInstrumentLineItems
Long-term Debt	954,342	954,348
Current portion of long-term debt and short-term debt	1,259	1,069
Long-term debt	953,083	953,279
Carrying Reported Amount Fair Value Disclosure [Member] \| Industrial Revenue Bond [Member]
DebtInstrumentLineItems
Long-term Debt	0	8,400
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Five Fifty One [Member]
DebtInstrumentLineItems
Long-term Debt	150,000	150,000
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Three Eighty Four [Member]
DebtInstrumentLineItems
Long-term Debt	100,307	99,934
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Three Seventy [Member]
DebtInstrumentLineItems
Long-term Debt	225,000	225,000
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Three Eighty Five [Member]
DebtInstrumentLineItems
Long-term Debt	100,450	98,360
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Four Twenty Four [Member]
DebtInstrumentLineItems
Long-term Debt	201,422	197,237
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Four Zero Five [Member]
DebtInstrumentLineItems
Long-term Debt	75,904	74,348
Carrying Reported Amount Fair Value Disclosure [Member] \| Senior Notes Four Eleven [Member]
DebtInstrumentLineItems
Long-term Debt	100,000	100,000
Carrying Reported Amount Fair Value Disclosure [Member] \| Other Debt Obligations [Member]
DebtInstrumentLineItems
Long-term Debt		1,069
Estimate Of Fair Value Fair Value Disclosure [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	961,408	968,514
Current portion of long-term debt and short-term debt	1,259	1,069
Long-term debt	960,149	967,445
Estimate Of Fair Value Fair Value Disclosure [Member] \| Industrial Revenue Bond [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	0	8,400
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Five Fifty One [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	158,024	162,617
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Three Eighty Four [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	100,307	99,934
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Three Seventy [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	224,322	225,748
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Three Eighty Five [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	100,450	98,360
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Four Twenty Four [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	201,422	197,237
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Four Zero Five [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	75,904	74,348
Estimate Of Fair Value Fair Value Disclosure [Member] \| Senior Notes Four Eleven [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	99,720	100,801
Estimate Of Fair Value Fair Value Disclosure [Member] \| Other Debt Obligations [Member]
DebtInstrumentLineItems
Long Term Debt Fair Value	$ 1,259	$ 1,069

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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 210.5-02.19,20)
-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.

+ Details

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- Definition

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

Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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