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Stockholders' Equity - Summary of Pro-Forma Adjustments to Consolidated Balance Sheet (Parenthetical) (Detail) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements Captions [Line Items]    
Cumulative convertible preferred stock, par value $ 0.01 $ 0.01
Common stock, par value $ 0.01 0.01
Pro-Forma [Member]    
Condensed Balance Sheet Statements Captions [Line Items]    
Cumulative convertible preferred stock, par value   0.01
Common stock, par value   $ 0.01