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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 9,294,479 $ 9,415,295 $ 9,212,974
Other dialysis acquisitions      
Business Acquisition [Line Items]      
Current assets 3,843 915 7,215
Property and equipment 12,436 5,999 23,760
Amortizable intangible and other long-term assets 4,345 4,193 31,098
Goodwill 97,093 221,514 271,267
Long-term deferred income taxes (1,467)   (5,666)
Noncontrolling interests assumed (18,905) (25,963) (22,880)
Liabilities assumed (1,440) (1,883) (19,265)
Aggregate purchase cost 104,864 295,875 335,077
Other dialysis acquisitions | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets, other than goodwill   74,515 31,838
Other dialysis acquisitions | Noncompetition agreements      
Business Acquisition [Line Items]      
Intangible assets, other than goodwill $ 8,959 $ 16,585 $ 17,710