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Net Income Per Common Share - Summary of Basic and Diluted Weighted Average Common Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 18,287 20,117 18,886 21,226
Weighted average common equivalent shares 262 548 283 464
Diluted weighted average common shares outstanding 18,549 20,665 19,169 21,690
Equity instruments excluded from diluted weighted average share calculation as effect would have been anti-dilutive 610 608 591 700