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Weighted Average Diluted Common Shares Outstanding (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total number of anti-dilutive potential common shares 165 239 83 233