Nature of Operations, Proposed Merger, Basis of Presentation and Principles of Consolidation - Additional Information (Details) $ / shares in Units, $ in Millions	Oct. 27, 2017 USD ($) $ / shares	Oct. 18, 2017	Dec. 31, 2017 country
Accounting Policies [Abstract]
Number of countries in which entity operates | country			21
Fresenius Medical Care Holdings, Inc.
Business Acquisition [Line Items]
Share price | $ / shares	$ 30.00
Waiting period term		30 days
Extension term	180 days
Termination fee, fee paid to acquiree	$ 100
Termination fee, fee paid to acquirer	$ 60
Period to not enter into alternative acquisition after termination	12 months