Commitments and Contigencies (Detail) $ in Millions		1 Months Ended			2 Months Ended	3 Months Ended		4 Months Ended	5 Months Ended			6 Months Ended		7 Months Ended		8 Months Ended	9 Months Ended		10 Months Ended	11 Months Ended	12 Months Ended		22 Months Ended	27 Months Ended
	Mar. 02, 2015 Computers Residents	Jan. 18, 2016 USD ($) Claims	Apr. 30, 2014 Agencies	Jan. 31, 2014 Claims	Mar. 09, 2011 USD ($) Claims	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	May 05, 2016 USD ($)	Jun. 10, 2015 USD ($)	May 21, 2015	Jun. 06, 2011 Beneficiary	Jul. 13, 2016 USD ($)	Jun. 27, 2016	Aug. 04, 2016 USD ($)	Jul. 25, 2012 Employee	Sep. 13, 2012 Employee	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Nov. 03, 2015	Nov. 21, 2016 USD ($)	Dec. 31, 2016 USD ($) States	Dec. 31, 2015 USD ($)	Nov. 10, 2009 Claims	Mar. 31, 2010 Beneficiary
Commitments And Contingencies Disclosure [Line Items]
Health insurance retention limit																					$ 0.9
Workers' compensation insurance retention limit																					0.5
Professional liability insurance retention limit																					$ 0.3
Corporate Integrity Agreement Term																					5 years
Number Of States With Facilities | States																					34
Payments for Legal Settlements												$ 0.2
Wage and Hour Litigation [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency, Settlement Agreement, Consideration									$ 8.0
Loss Contingency Accrual																		$ 8.0				$ 5.3
Wage and Hour Litigation [Member] | Illinois [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of former employees who filled a putative collective and class action complaint | Employee																1
Loss Contingency, Settlement Agreement, Consideration														$ 0.8
Loss Contingency Accrual																	$ 0.8
Payments for Legal Settlements																				$ 0.6
Wage and Hour Litigation [Member] | Connecticut [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of former employees who filled a putative collective and class action complaint | Employee															3
Payments for Legal Settlements							$ 5.3
OIG Self-Disclosure [Member]
Commitments And Contingencies Disclosure [Line Items]
Loss Contingency Accrual								$ 4.7														$ 4.7
Payments for Legal Settlements						$ 4.7															$ 0.4
Computer Inventory And Data Security Reporting [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of Missing Computers and Laptops | Computers	142
Threshold of Individuals in Data Breach | Residents	500
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
Frontier Litigation [Member]
Commitments And Contingencies Disclosure [Line Items]
Payments for Legal Settlements																					$ 2.9
Home Health [Member] | Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims																							137
Recovery amount of overpayment made to subsidiary including interest												$ 0.2
Home Health [Member] | Extrapolated [Member] | Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims					114
Recovery amount of the overpayment made to the subsidiary					$ 5.6
Home Health [Member] | Unfavorable [Member] | Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims				28
Home Health [Member] | Favorable In Full [Member] | Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims				76
Number of claims appealed | Claims				74
Home Health [Member] | Favorable In Part [Member] | Ohio [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of claims submitted by subsidiary | Claims				10
Number of claims appealed | Claims				8
Home Health [Member] | Frontier Litigation [Member]
Commitments And Contingencies Disclosure [Line Items]
Number Of Care Centers Sold | Agencies			5
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		$ 3.7
Recovery amount of overpayment made to subsidiary including interest		$ 5.6
Recovery amount of over payment made to subsidiary including interest withheld						$ 5.7
Hospice [Member] | Frontier Litigation [Member]
Commitments And Contingencies Disclosure [Line Items]
Number Of Care Centers Sold | Agencies			4
Hospice [Member] | US Department of Justice [Member] | Massachusetts [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients										53
Hospice [Member] | US Department of Justice [Member] | Morgantown, West Virginia [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients																			66
Hospice [Member] | US Department of Justice [Member] | Parkersburg, West Virginia [Member]
Commitments And Contingencies Disclosure [Line Items]
Number of patients													68