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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 40,286 $ 39,469
Other intangible assets, accumulated amortization $ 825,419 $ 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 337,874,535 337,279,449
Class A common stock, shares outstanding 337,874,535 337,279,449