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Segment Information, Nature of Operations, and Certain Concentrations - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 Trade_Names metropolitan_area segment
Segment Reporting Information [Line Items] |
Number of trade names | Trade_Names | 3
Number of metropolitan areas Ryan Homes product are sold | metropolitan_area | 33
Senior Notes due 2022 |
Segment Reporting Information [Line Items] |
Senior notes interest rate | 3.95%
Senior Notes Due Two Thousand Thirty [Member] |
Segment Reporting Information [Line Items] |
Senior notes interest rate | 3.00%
Home Building |
Segment Reporting Information [Line Items] |
Number of reportable segments | 4
Mortgage Banking |
Segment Reporting Information [Line Items] |
Number of reportable segments | 1
Geographic Concentration Risk | Home Building | District of Columbia |
Segment Reporting Information [Line Items] |
Revenue derived | 24.00%
Geographic Concentration Risk | Home Building | Maryland, Baltimore |
Segment Reporting Information [Line Items] |
Revenue derived | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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