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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance $ 279,429 $ 264,144
Property and equipment, accumulated depreciation 2,622,476 2,397,007
Intangible assets, accumulated amortization $ 852,860 $ 770,691
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, issued 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 450,000,000 450,000,000
Common stock, shares issued 217,338,629 217,120,346
Common stock, shares outstanding 206,904,375 209,754,247
Treasury stock, shares 10,434,254 7,366,099