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Long-Term Debt and Capital Leases - Components of Long-Term Debt and Capital Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2014
Debt Instrument [Line Items]
Long-term debt and capital lease	$ 523,647	$ 535,711	$ 508,019
Less-current maturities of long-term debt	1,448	1,656	885
Non current portion of long term debt and capital lease obligation	522,199	534,055	507,134
Senior Secured Asset Based Revolving Credit Facility, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	57,422
Senior Secured Revolving Credit Facility, Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease		131,300	133,860
Revenue Bonds Series 2014 Due December 2044 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	25,000	25,000
Revenue Bonds Series 2005R-2, Due January 2025 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	21,400	21,400	21,400
Revenue Bonds Series 2015 Due August 2035 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	15,000
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	16,000	16,000	16,000
Revenue Bonds Series 2013 Due April 2029 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	11,000	11,000
Revenue Bonds Series, 2005R-1, Due January 2025 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	3,600	3,600	3,600
Revenue Bond Series 2013 Letter Of Credit Backed Due 2029 [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease			5,500
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	4,130	3,295	3,710
Notes Payable [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	1,167	435	440
Senior Subordinated Notes Due 2019 Notes [Member]
Debt Instrument [Line Items]
Long-term debt and capital lease	$ 368,928	$ 323,681	$ 323,509

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and 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 210.9-03.13,16)
-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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

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

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

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+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
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