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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts receivable, related parties $ 0.7 $ 1.7
M/I Homes Inc    
Related Party Transaction [Line Items]    
Accounts receivable, related parties   $ 1.3