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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Balance Sheet - Additional Information (Detail) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 139,583,990 101,627,296
Common stock, shares outstanding (in shares) 139,076,064 101,341,619
Treasury stock, shares (in shares) 507,926 285,677
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) 300,000,000 300,000,000
Common stock, shares issued (in shares) 139,583,990 101,627,296
Treasury stock, shares (in shares) 507,926 285,677