Description of Business - Additional Information (Details)					6 Months Ended
	Jun. 25, 2025 USD ($) Property	May 12, 2025 USD ($)	Feb. 10, 2025 USD ($) Property	Feb. 07, 2025 USD ($) Property $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 24, 2025 USD ($)
Description of business [Line Items]
Date of incorporation					Mar. 19, 2024
Entity incorporation state					MD
Common stock par value per share | $ / shares					$ 0.01
Land banking proceeds to acquire amount					$ 858,938,000
Revolving Credit Facility
Description of business [Line Items]
Commitment amount					$ 25,000,000
Maturity date				Feb. 07, 2028
Class A Common Stock
Description of business [Line Items]
Common stock par value per share | $ / shares					$ 0.01
Class B Common Stock
Description of business [Line Items]
Common stock par value per share | $ / shares					$ 0.01
Lennar Corporation
Description of business [Line Items]
Percentage of ownership interest after disposal				20.00%
Spin-Off | Lennar Corporation
Description of business [Line Items]
Percentage of ownership interest sold				80.00%
Retained shares | shares				33,200,053
Land assets				$ 5,500,000,000
Number of homesites | Property				87,000
Cash				$ 1,000,000,000
Cash deposits				584,800,000
Spin-Off | Lennar Corporation | Revolving Credit Facility
Description of business [Line Items]
Commitment amount				$ 1,335,000,000
Maturity date				Feb. 07, 2028
Spin-Off | Lennar Corporation | Class A Common Stock
Description of business [Line Items]
Distribution of common stock | shares				120,983,633	120,983,633
Common stock par value per share | $ / shares				$ 0.01
Retained shares | shares				33,200,053	33,200,053
Spin-Off | Lennar Corporation | Class B Common Stock
Description of business [Line Items]
Distribution of common stock | shares				11,819,811	11,819,811
Common stock par value per share | $ / shares				$ 0.01
Rausch Coleman Companies, LLC
Description of business [Line Items]
Number of homesites | Property			25,000
Acquisition in land assets			$ 1,158,000,000
Percentage of interest acquired			100.00%
Cash payment received from acquisition			$ 859,000,000
Landsea Homes | Agreement with New Home Company
Description of business [Line Items]
Number of homesites | Property	4,186
Acquisition in land assets	$ 522,800,000
Cash payment received from acquisition	494,500,000
Land banking proceeds to acquire amount	494,500,000
Option contract to acquire business	$ 28,300,000
Landsea Homes | Agreement with New Home Company | Delayed Draw Term Loan
Description of business [Line Items]
Delayed draw term loan						$ 1,000,000,000
Landsea Homes | Maximum | Agreement with New Home Company
Description of business [Line Items]
Land banking proceeds to acquire amount		$ 700,000,000