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Long-Term Debt - Components of Long-Term Debt and Capital Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount of long-term debt and capital leases $ 531,234 $ 525,019
Less-unamortized discount and debt issuance costs 16,556 17,586
Long-term debt and capital lease 514,678 507,433
Less-current maturities of long-term debt 1,458 1,448
Non current portion of long term debt and capital lease obligation 513,220 505,985
Senior Secured Asset Based Revolving Credit Facility, Due 2020 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 68,000 57,422
Less-unamortized discount and debt issuance costs 5,335 5,593
Revenue Bonds Series 2014 Due December 2044 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 25,000 25,000
Less-unamortized discount and debt issuance costs 1,361 1,407
Revenue Bonds Series 2005R-2, Due January 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 21,400 21,400
Less-unamortized discount and debt issuance costs 553 566
Revenue Bonds Series 2015 Due August 2035 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 15,000 15,000
Less-unamortized discount and debt issuance costs 812 830
Long-Term Revenue Bonds Series 2013 Due April 2036 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 16,000 16,000
Less-unamortized discount and debt issuance costs 628 636
Revenue Bonds Series 2013 Due April 2029 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 11,000 11,000
Less-unamortized discount and debt issuance costs 659 690
Revenue Bonds Series, 2005R-1, Due January 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 3,600 3,600
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 3,997 4,130
Notes Payable [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 1,167 1,167
Senior Subordinated Notes Due 2019 Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt and capital lease 366,070 370,300
Less-unamortized discount and debt issuance costs $ 7,174 $ 7,829