Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
Related Party Transactions (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Accounts receivable due from Parent	$ 0		$ 0		$ 22,190,000
Land and land under development	2,192,885,000		2,192,885,000		1,636,024,000
Revenues	856,026,000	$ 1,430,011,000	2,992,900,000	$ 4,235,592,000
Homebuilding:
Related Party Transaction [Line Items]
Land and land under development	2,192,885,000		2,192,885,000		1,636,024,000
Revenues	832,292,000	1,386,655,000	2,911,594,000	4,123,303,000
Gross profit	84,949,000	246,823,000	374,844,000	734,130,000
Related Party
Related Party Transaction [Line Items]
Accounts receivable due from Parent					$ 22,200,000
Sale of land		$ 0		$ 0
Related Party \| SH Residential Holdings, LLC
Related Party Transaction [Line Items]
Land and land under development	92,400,000		92,400,000
Sale of land	8,400,000		8,400,000
Related Party \| SH Residential Holdings, LLC \| Homebuilding:
Related Party Transaction [Line Items]
Revenues	23,400,000		51,400,000
Gross profit	$ 2,900,000		$ 6,600,000

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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SEKISUI HOUSE U.S., INC. 10-Q