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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Balance Sheet - Additional Information (Detail) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 900,000,000 450,000,000
Common stock, shares issued (in shares) 320,469,049 270,627,014
Common stock, shares outstanding (in shares) 318,377,161 269,295,466
Treasury stock, shares (in shares) 2,091,888 1,331,548
Parent/ Issuer    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 900,000,000 450,000,000
Common stock, shares issued (in shares) 320,469,049 270,627,014
Treasury stock, shares (in shares) 2,091,888 1,331,548