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Earnings Per Share - Schedule of Weighted-Average Number of 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
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 92,449 92,186 92,408 92,164
Dilution effect of stock awards at end of period 387 230 430 179
Diluted weighted average common shares outstanding 92,836 92,416 92,838 92,343
Anti-dilutive stock-based compensation awards 789 748 719 541