Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values (Parenthetical) (Detail) - Recourse debt [Member] - 5.30% Senior Notes due in 2025 ("2025 Notes") [Member] |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Interest Rate | 5.30% | 5.30% |
| Maturity Date | Aug. 31, 2025 | Aug. 31, 2025 |