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Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)
Jun. 30, 2019
Dec. 31, 2018
6.0% Working Capital Revolver Loan [Member]    
Debt Instrument [Line Items]    
Line of credit facility, interest rate 6.00% 6.00%
5.25% Secured Promissory Note Due 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, effective Interest Rate 5.25% 5.25%
6.69% Secured Promissory Note Due 2023 [Member]    
Debt Instrument [Line Items]    
Long-term debt, effective Interest Rate 6.69% 6.69%
8.32% Secured Financing Due 2023 [Member]    
Debt Instrument [Line Items]    
Long-term debt, effective Interest Rate 8.32% 8.32%