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Long-Term Debt - Components of Long-Term Debt and Capital Leases (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Feb. 28, 2015	Sep. 30, 2015	Dec. 31, 2014
Senior Secured Asset Based Revolving Credit Facility, Due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Feb. 26, 2020
Debt instrument stated percentage		2.25%
Senior Secured Revolving Credit Facility, Due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Mar. 18, 2016
Debt instrument stated percentage		3.75%
Revenue Bonds Series 2014 Due December 2044 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Dec. 01, 2044
Debt instrument stated percentage		3.75%
Revenue Bonds Series 2005R-2, Due January 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Jan. 01, 2025
Debt instrument stated percentage		6.25%
Revenue Bonds Series 2015 Due August 2035 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Aug. 01, 2035
Debt instrument stated percentage		5.125%
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Apr. 01, 2036
Debt instrument stated percentage		4.75%
Revenue Bonds Series 2013 Due April 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Apr. 01, 2029
Debt instrument stated percentage		4.00%
Revenue Bonds Series, 2005R-1, Due January 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, due date		Jan. 01, 2025
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Apr. 01, 2023
Debt instrument stated percentage		7.70%
Notes Payable [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Apr. 01, 2017
Debt instrument stated percentage		6.00%
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Feb. 15, 2019	Feb. 15, 2019
Debt instrument stated percentage	7.75%	7.75%
Senior second lien notes, unamortized discount	$ 476	$ 1,486	$ 1,319

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

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

+ 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(a)(1))



-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

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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(a)(2))



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

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- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ 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(a)(2))



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

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 45



-Paragraph 1A



-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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-Name Accounting Standards Codification



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-Section 55



-Paragraph 8



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