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Basic and Diluted Earnings per Share - Shares Excluded from Computation of Diluted earnings Per Share (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares 15,314,114 15,265,732 17,165,060 15,211,875