Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2019
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%