Acquisitions and Disposals - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 JointVenture	Dec. 31, 2012
Business Acquisition [Line Items]
Total purchase price for acquisitions	$ 75,500,000	$ 27,300,000
Cash	73,933,000	26,920,000	6,758,000
Noncontrolling goodwill	113,000	622,000
Acquisition paid in assumed liabilities		400,000
Number of joint ventures in which additional ownership interests were acquired		6
Purchase price to acquire additional ownership interests in joint ventures		1,900,000
Decrease in noncontrolling interest redeemable		600,000
Reduction in additional paid in capital as a result of the purchase of additional ownership interests		1,300,000
Minimum [Member]
Business Acquisition [Line Items]
Estimated useful life	2 years
Maximum [Member]
Business Acquisition [Line Items]
Estimated useful life	5 years
Home Health Entity [Member]
Business Acquisition [Line Items]
Goodwill Recognized		23,200,000
Home-based services [Member]
Business Acquisition [Line Items]
Number of entities acquired	46
Goodwill Recognized	40,000,000
General and Administrative Expense [Member]
Business Acquisition [Line Items]
Acquisition-related cost	1,000,000	600,000
Hospice Entity [Member]
Business Acquisition [Line Items]
Number of entities acquired	6
Goodwill Recognized	$ 5,300,000	$ 2,500,000