Commitments and Contingencies (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) lot
Loss Contingencies [Line Items]
Surety bonds, outstanding, amount	$ 330.9
Letters of credit outstanding, amount	169.7
Estimated cost related to letters of credit	159.0
Estimated cost related to bonds	$ 113.9
Number of lots | lot	12,375
Option Contracts
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 14.5
Deposits	40.6
HomeAmerican
Loss Contingencies [Line Items]
Surety bonds, outstanding, amount	$ 130.0