Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Number_of_Visits D	Sep. 30, 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 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	100.00%	100.00%	99.00%	98.00%
Estimated amounts due back to Medicare	$ 3.0		$ 3.0		$ 4.8
Percentage of patient receivables outstanding			10.00%
Minimum days for accounts receivable outstanding to be fully reserved			365
Portion of accounts receivable derived from Medicare			70.00%		68.00%
Revenue adjustment to Medicare revenue	2.5	2.7	9.1	7.4
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
Income Taxes [Line Items]
Statutory Tax Rate			39.50%		39.00%
Income Tax Benefit For Change In Statutory Tax Rate	1.5
U.S. Department of Justice Settlement [Member]
Income Taxes [Line Items]
unrecognized tax benefits	3.1
Deferred tax asset accrued charge related to U.S Department of Justice settlement	$ 59.2		$ 59.2