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Other Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Other Receivables, Net, Current [Abstract]    
Other receivables $ 435,885 $ 400,916
Supplier rebates and other non-trade receivables    
Other Receivables, Net, Current [Abstract]    
Other receivables 316,644 265,693
Medicare bad debt claims    
Other Receivables, Net, Current [Abstract]    
Other receivables 105,714 118,504
Operating advances under management and administrative services agreements    
Other Receivables, Net, Current [Abstract]    
Other receivables $ 13,527 $ 16,719