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Earnings Per Share - Schedule of Weighted-Average Number of 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
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 92,399 92,176 92,387 92,153
Dilution effect of stock awards at end of period 303 46 425 186
Diluted weighted average common shares outstanding 92,702 92,222 92,812 92,339
Anti-dilutive stock-based compensation awards 914 634 711 397