v2.4.1.9
Noncontrolling Interests Subject to Put Provisions and Other Commitments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Commitments And Contingencies Disclosure [Line Items]  
Other potential commitments to provide operating capital to several dialysis centers $ 1,000us-gaap_OtherCommitment
Schedule of Joint ventures to dissolve Certain consolidated joint ventures are contractually scheduled to dissolve after terms ranging from ten to fifty years.
Minimum  
Commitments And Contingencies Disclosure [Line Items]  
Scheduled dissolution term of joint ventures 10 years
Maximum  
Commitments And Contingencies Disclosure [Line Items]  
Scheduled dissolution term of joint ventures 50 years