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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 559,585 $ 520,422
Unamortized discount and debt issuance costs (7,690) (8,726)
Less revolving credit facility and current portion of long-term debt 46,080 22,468
Long-term debt, net 513,505 497,954
4.00% Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 30,907 0
7.75% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 425,000 425,000
12% Senior Secured Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,000 50,000
3.69% Secured Promissory Note Due 2017 [Member]    
Debt Instrument [Line Items]    
Long-term debt 10,804 15,856
5.73% Secured Promissory Note due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 9,667  
5.25% Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt 15,716 16,189
4.72% Secured Promissory Note Due 2023 [Member]    
Debt Instrument [Line Items]    
Long-term debt 19,635 15,000
Other [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 5,546 $ 7,103