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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 520,422 $ 450,885
Unamortized discount and debt issuance costs (8,726) (6,433)
Less current portion of long-term debt 22,468 10,680
Long-term debt, net 497,954 440,205
4.00% Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 0 0
7.75% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 425,000 425,000
12.0% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,000  
3.42% Secured Promissory Note Due 2016 [Member]    
Debt Instrument [Line Items]    
Long-term debt 15,856 22,814
5.25% Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt 16,189  
4.24% Secured Promissory Note Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt 15,000  
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 7,103 $ 9,504