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Long-Term Debt and Capital Leases - Components of Long-Term Debt and Capital Leases (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 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%
Debt instrument, description of variable rate basis	one month LIBOR
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%
Debt instrument, description of variable rate basis	one month LIBOR
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
Revenue Bond Series 2013 Letter Of Credit Backed Due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Apr. 01, 2029
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	Dec. 01, 2017
Debt instrument stated percentage	7.00%
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Debt instrument, due date	Feb. 15, 2019
Debt instrument stated percentage	7.75%
Senior second lien notes, unamortized discount	$ 1,372	$ 1,319	$ 1,491

X

- Definition

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

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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