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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet - Additional Information (Details) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 320,010,534 270,627,014
Common stock, shares outstanding (in shares) 317,985,056 269,295,466
Treasury stock, shares (in shares) 2,025,478 1,331,548