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Contingencies - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2012
Entity
Dec. 31, 2015
USD ($)
Other Commitments [Line Items]      
Litigation settlement amount $ 450,000    
Legal fees $ 45,000    
Estimated accrual for potential damages and liabilities     $ 22,000
Other dialysis acquisitions      
Other Commitments [Line Items]      
Number of businesses acquired | Entity   2