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Weighted Average Diluted Common Shares Outstanding (Detail)
In Thousands, unless otherwise specified
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]        
Total number of anti-dilutive potential common shares 386 406 188 231