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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 47,596 $ 39,469
Other intangible assets, accumulated amortization $ 943,587 $ 771,673
Class A common stock, par value $ 0.01 $ 0.01
Class A common stock, shares authorized 525,000,000 525,000,000
Class A common stock, shares issued 339,459,138 337,279,449
Class A common stock, shares outstanding 339,459,138 337,279,449