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Equity and Earnings Per Share - Calculations of Earnings Per Share of Common Stock (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 0 0 0 0