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Noncontrolling Interests Subject to Put Provisions and Other Commitments - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Nov. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]          
Schedule of Joint ventures to dissolve     Certain consolidated joint ventures are originally contractually scheduled to dissolve after terms ranging from 10 to 50 years.    
HealthCare Partners (HCP)          
Commitments And Contingencies Disclosure [Line Items]          
Required minimum cash balance     $ 59,897    
Epogen          
Commitments And Contingencies Disclosure [Line Items]          
Long term purchase commitment, period   7 years      
Long term purchase commitment, expiration date   Dec. 31, 2018 Dec. 31, 2013    
Long term purchase commitment, origination date     Jan. 01, 2013    
Dialysis Equipment, Parts and Supplies          
Commitments And Contingencies Disclosure [Line Items]          
Long-term purchase commitment, time period     In January 2010, the Company entered into an agreement with Fresenius Medical Care (FMC) which committed the Company to purchase a certain amount of dialysis equipment, parts and supplies from FMC through 2013. This agreement has been subsequently extended through February 2016.    
Long term purchase commitment, expiration year     2013    
Purchase commitment, purchase during the period     $ 154,566 $ 154,266 $ 144,030
Dialysis Equipment, Parts and Supplies | Extended Expiration          
Commitments And Contingencies Disclosure [Line Items]          
Long term purchase commitment, expiration month     2016-02    
Hemodialysis Products, Supplies and Equipment          
Commitments And Contingencies Disclosure [Line Items]          
Long-term purchase commitment, time period     In 2014, the Company entered into an agreement with Baxter Healthcare (Baxter) which committed the Company to purchase a certain amount of its hemodialysis non-equipment product supplies, such as dialyzers, at fixed prices through 2018    
Long term purchase commitment, expiration year     2018    
Purchase commitment, purchase during the period     $ 112,931 $ 112,645 $ 124,555
Minimum          
Commitments And Contingencies Disclosure [Line Items]          
Scheduled dissolution term of joint ventures     10 years    
Minimum | Epogen          
Commitments And Contingencies Disclosure [Line Items]          
Long-term purchase commitment, percentage of quantity required 90.00% 90.00%      
Maximum          
Commitments And Contingencies Disclosure [Line Items]          
Scheduled dissolution term of joint ventures     50 years    
Commitments to provide operating capital          
Commitments And Contingencies Disclosure [Line Items]          
Other potential commitments to provide operating capital to several dialysis centers     $ 5,600