Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Day	Jun. 30, 2011	Dec. 31, 2011
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
CMS therapy assessment requirement interval minimum, days			30
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	96.00%	97.00%	96.00%	97.00%
CMS hospice face-to-face requirement prior to third benefit period, days			30
Days in hospice recertification third benefit period			180
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			68.00%		73.00%
Revenue adjustment to Medicare revenue	$ 2.2	$ 2.4	$ 5.0	$ 4.7
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
Cap Year 2010 - 2012
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare	$ 4.2		$ 4.2		3.1