Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013 Number_of_Visits D	Mar. 31, 2012	Dec. 31, 2012
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Episode of care as episodic-based revenue, days	60
Percentage of total reimbursement of outlier payment	10.00%
Low utilization payment adjustment, maximum number of visits	5
First threshold of therapy services required, visits	6
Second threshold of therapy services required, visits	14
Third threshold of therapy services required, visits	20
Historical collection rate from Medicare	99.00%
Episodes of progress that begin during reporting period, days	60
Hospice Medicare revenue rate accounted for routine care	99.00%	98.00%
Estimated amounts due back to Medicare	$ 3.8		$ 4.8
Percentage of patient receivables outstanding related to single payor	10.00%
Minimum days for accounts receivable outstanding to be fully reserved	365
Portion of accounts receivable derived from Medicare	68.00%		68.00%
Revenue adjustment to Medicare revenue	$ 3.9	$ 2.7
Rate of request for anticipated payment submitted for the initial episode of care	60.00%
Rate of request for anticipated payment submitted for subsequent episodes of care	50.00%
Maximum days to submit final bill from the start of episode	120
Maximum days to submit final bill from the date the request for anticipated payment was paid	60