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Quarterly Financial Information - Balance Sheets (Parenthetical) (Detail) - $ / shares
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Quarterly Financial Information [Line Items]                
Preferred stock par value $ 0.01       $ 0.01      
Preferred stock authorized 2,000,000       2,000,000      
Preferred stock issued 0       0      
Common stock par value $ 0.01       $ 0.01      
Common stock authorized 206,000,000       206,000,000      
As Restated [Member]                
Quarterly Financial Information [Line Items]                
Preferred stock par value   $ 0.01 $ 0.01 $ 0.01   $ 0.01 $ 0.01 $ 0.01
Preferred stock authorized   2,000,000 2,000,000 2,000,000   2,000,000 2,000,000 2,000,000
Preferred stock issued   0 0 0   0 0 0
Common stock par value   $ 0.01 $ 0.01 $ 0.01   $ 0.01 $ 0.01 $ 0.01
Common stock authorized   206,000,000 206,000,000 206,000,000,000   206,000,000 206,000,000 206,000,000