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Equity and Earnings Per Share - Schedule of Basic and Diluted Earnings per Share (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Number of options excluded from diluted EPS calculation 0 0 0 0