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v3.20.4

Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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3.75% Working Capital Revolver Loan [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility, interest rate | 3.75% | 3.75%
5.25% Secured Promissory Note Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 5.25% | 5.25%
1.00% Unsecured Loan Agreement due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 1.00% | 1.00%
8.32% Secured Financing Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 8.32% | 8.32%
8.75% Secured Loan Agreement Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 8.75% | 8.75%
8.75% Secured Financing Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, effective Interest Rate | 8.75% | 8.75%

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