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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Senior Notes | 5.45% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date	Sep. 30, 2034
Effective interest rate	5.49%
Senior Notes | 2.40% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date	Aug. 15, 2031
Effective interest rate	2.44%
Senior Notes | 4.00% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date	May 15, 2030
Effective interest rate	4.05%
Senior Notes | 4.60% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date	Nov. 15, 2024
Effective interest rate	4.60%
Notes Payable, Other Payables
Debt Instrument [Line Items]
Other notes and contracts payable maturities in year	2029
Weighted-average interest rate	3.77%	3.41%

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