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v3.10.0.1

Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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6.00% Working Capital Revolver Loan [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility, interest rate | 6.00% | 6.00%
5.73% Secured Promissory Note Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 5.73% | 5.73%
5.25% Secured Promissory Note Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 5.25% | 5.25%
6.76% Secured Promissory Note Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 6.76% | 6.76%

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