Commitments and Contingencies (Detail) $ in Thousands		1 Months Ended		3 Months Ended			5 Months Ended		6 Months Ended	8 Months Ended	9 Months Ended		10 Months Ended	27 Months Ended	74 Months Ended
	Mar. 02, 2015 Computers	Aug. 31, 2017 USD ($) Beneficiary	Jan. 18, 2016 USD ($) Claims	Sep. 30, 2017 USD ($) Agencies States	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 21, 2015	Jun. 06, 2011 Beneficiary	Jun. 27, 2016	Aug. 19, 2016	Sep. 30, 2017 USD ($) Agencies States D	Sep. 30, 2016 USD ($)	Nov. 03, 2015	Mar. 31, 2010 Beneficiary	Sep. 30, 2011 D	Dec. 31, 2016 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Health insurance retention limit											$ 900
Workers' compensation insurance retention limit											500
Professional liability insurance retention limit											$ 300
Corporate Integrity Agreement Term				5 years
Number Of States With Facilities | States				34							34
Episode Of Care As Episodic Based Revenue | D											60
Securities Class Action Lawsuit settlement, net				$ 0		$ 0					$ 28,712	$ 0
Accounts Receivable Net Current				177,402							177,402					$ 166,056
Computer Inventory And Data Security Reporting [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of Missing Computers and Laptops | Computers	142
Computer Inventory And Data Security Reporting [Member] | Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Year of Departure	2011
Computer Inventory And Data Security Reporting [Member] | Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Year of Departure	2014
SafeGuard Zone Program Integrity Contractor [Member] | Florida [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Accrual				17,400
Indemnity Receivable				$ 10,900							$ 10,900
SafeGuard Zone Program Integrity Contractor [Member] | Florida [Member] | Infinity Home Care, L.L.C. [Member]
Commitments And Contingencies Disclosure [Line Items]
Indemnification Amount		$ 12,600
Securities Class Action Lawsuit [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Accrual					$ 43,700
Loss Contingency Number Of Defendants															7
Episode Of Care As Episodic Based Revenue | D															60
Settlement Amount To Be Paid By Company's Insurance Carriers					$ 15,000
Securities Class Action Lawsuit [Member] | Favorable [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Number Of Defendants										2
Securities Class Action Lawsuit [Member] | Unfavorable [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Number Of Defendants										4
Securities Class Action Lawsuit [Member] | Favorable In Part [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Number Of Defendants										3
Home Health [Member]
Commitments And Contingencies Disclosure [Line Items]
Operating Care Centers | Agencies				328							328
Securities Class Action Lawsuit settlement, net				$ 0							$ 0
Home Health [Member] | SafeGuard Zone Program Integrity Contractor [Member] | Florida [Member]
Commitments And Contingencies Disclosure [Line Items]
Recovery amount of the overpayment made to the subsidiary		$ 38,800
Florida ZPIC revenue reduction				6,500
Home Health [Member] | SafeGuard Zone Program Integrity Contractor [Member] | Florida [Member] | Infinity Home Care, L.L.C. [Member]
Commitments And Contingencies Disclosure [Line Items]
Accounts Receivable Net Current				$ 7,800							$ 7,800
Home Health [Member] | SafeGuard Zone Program Integrity Contractor [Member] | Lakeland, Florida [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Beneficiary		72
Recovery amount of the overpayment made to the subsidiary		$ 34,000
Actual Claims Payment		$ 200
Error Rate, Percentage		100.00%
Home Health [Member] | SafeGuard Zone Program Integrity Contractor [Member] | Clearwater, Florida [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Beneficiary		70
Recovery amount of the overpayment made to the subsidiary		$ 4,800
Actual Claims Payment		$ 200
Error Rate, Percentage		100.00%
Hospice [Member]
Commitments And Contingencies Disclosure [Line Items]
Operating Care Centers | Agencies				81							81
Securities Class Action Lawsuit settlement, net				$ 0							$ 0
Hospice [Member] | South Carolina [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of beneficiaries | Beneficiary														30
Hospice [Member] | Extrapolated [Member] | South Carolina [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of beneficiaries | Beneficiary								16
Hospice [Member] | Unfavorable [Member] | South Carolina [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims			9
Recovery amount of the overpayment made to the subsidiary			$ 3,700
Recovery Amount Of Over Payment Made To Subsidiary Including Interest			$ 5,600
Recovery amount of over payment made to subsidiary including interest withheld				5,700							5,700
Indemnity Receivable				$ 4,900							$ 4,900
Hospice [Member] | U.S. Department of Justice [Member] | Massachusetts [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients							53
Hospice [Member] | U.S. Department of Justice [Member] | Morgantown, West Virginia [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients													66
Hospice [Member] | U.S. Department of Justice [Member] | Parkersburg, West Virginia [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients									68