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Equity and Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Number of options excluded from diluted EPS calculation 0 0 0 0