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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Accounts receivable, related parties $ 2.4 $ 2.0
M/I Homes Inc [Member]    
Related Party Transaction [Line Items]    
Accounts receivable, related parties $ 1.4 $ 1.0