Business Combinations - Formation of Joint Business Entity and Acquisition of Netsmart, Inc - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended
	Apr. 19, 2016	Sep. 30, 2018
Business Acquisition [Line Items]
Contribution and investment agreement date		Mar. 20, 2016
Homecare Business [Member]
Business Acquisition [Line Items]
Escrow deposit related to the integration of homecare business	$ 15.0	$ 7.0
Escrow deposit period	5 years
Netsmart [Member]
Business Acquisition [Line Items]
Netsmart transaction completion date		Apr. 19, 2016