Leases (Details)	3 Months Ended
	Mar. 31, 2019 lease community
Leases [Abstract]
Operating and financing leases, number of communities | community	342
Operating leases, number of communities	251
Financing leases, number of communities	91
Operating lease, weighted average remaining lease term	7 years 6 months
Finance lease, weighted average remaining lease term	9 years
Operating lease, weighted average discount rate, percent	8.60%
Finance lease, weighted average discount rate, percent	7.80%
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