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Related Party Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Nov. 05, 2018
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Share repurchase, amount   $ 89,362  
Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Accounts receivable, related parties   2,300 $ 2,000
M/I Homes Inc [Member]      
Related Party Transaction [Line Items]      
Accounts receivable, related parties   $ 1,200 $ 1,000
PJAM IBP Holdings, Inc [Member]      
Related Party Transaction [Line Items]      
Common Stock Repurchase, Shares 150    
Share repurchase, amount $ 5,100    
Share repurchase, price per share $ 34.11    
Discount from last reported price of our common stock 3.00%