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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 62,011 $ 46,789
Other intangible assets, accumulated amortization $ 1,147,504 $ 1,000,738
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 340,880,302 339,459,138
Class A common stock, shares outstanding 340,880,302 339,459,138