Unsecured Borrowings - Unsecured Long-Term Borrowings (Parenthetical) (Detail) - Unsecured Debt [Member]	Dec. 31, 2019	Dec. 31, 2018
U.S. Dollar [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate debt obligations interest rates range	2.00%	2.00%
U.S. Dollar [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate debt obligations interest rates range	10.04%	10.04%
U.S. Dollar [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Fixed interest rate debt obligations interest rates range	3.82%	4.22%
Non-U.S. Dollar [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate debt obligations interest rates range	0.13%	0.31%
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	2.33%	2.43%