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Weighted Average Shares Outstanding - Summary of Weighted Average Number of Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Basic shares outstanding 25,181 23,879 25,163 23,873
Plus: Dilutive effect of ISOs 120 346 118 346
Plus: Dilutive effect of Restricted grants 271 63 271 63
Diluted shares outstanding 25,572 24,288 25,552 24,282