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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 496,448 $ 457,318
Less current portion of long-term debt 23,849 10,680
Long-term debt due after one year 472,599 446,638
Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 13,301  
7.75% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 425,000 425,000
Secured Promissory Note Due 2016 [Member]    
Debt Instrument [Line Items]    
Long-term debt 17,615 22,814
Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt 16,189  
Secured Promissory Note Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt 15,000  
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 9,343 $ 9,504