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Other Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other Receivables, Net, Current [Abstract]    
Other receivables $ 453,483 $ 435,885
Supplier rebates and other non-trade receivables    
Other Receivables, Net, Current [Abstract]    
Other receivables 347,123 316,644
Medicare bad debt claims    
Other Receivables, Net, Current [Abstract]    
Other receivables 104,658 105,714
Operating advances under management and administrative services agreements    
Other Receivables, Net, Current [Abstract]    
Other receivables $ 1,702 $ 13,527