v2.4.0.6
Earnings Per Share - Additional Information (Detail)
3 Months Ended6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Options not considered in diluted earnings per share computation as they were not dilutive262,874326,682273,555399,160