Acquisitions - Additional Information (Details) - Facility	4 Months Ended	9 Months Ended	12 Months Ended
May 14, 2020	Dec. 31, 2020	Dec. 31, 2021
Business Combinations [Abstract]
Acquisitions of outpatient mental health practices	6	17	24

Acquisitions of outpatient mental health practices.

No definition available.

Name:	lfst_AcquisitionsOfOutpatientMentalHealthPractices
Namespace Prefix:	lfst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration