Leases (Details)	9 Months Ended
	Sep. 30, 2021 community lease
Lessee, Lease, Description [Line Items]
Operating and financing leases, number of communities | community	300
Operating lease, number of communities	234
Financing leases, number of communities	66
Minimum
Lessee, Lease, Description [Line Items]
Finance and operating lease, renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Finance and operating lease, renewal term	20 years