Unsecured Borrowings - Unsecured Long-Term Borrowings (Parenthetical) (Detail) - Unsecured Debt [Member] |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| U.S. Dollar [Member] | Minimum [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 0.63% | 2.00% |
| U.S. Dollar [Member] | Maximum [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 9.30% | 10.04% |
| U.S. Dollar [Member] | Weighted Average [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 4.07% | 3.82% |
| Non-U.S. Dollar [Member] | Minimum [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 0.13% | 0.13% |
| Non-U.S. Dollar [Member] | Maximum [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 13.00% | 13.00% |
| Non-U.S. Dollar [Member] | Weighted Average [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed interest rate debt obligations interest rates range | 2.20% | 2.33% |