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Net Income Per Common Share - Summary of Weighted Average Number of Common Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Denominator:        
Basic weighted average shares outstanding 46,231 46,063 45,953 45,956
Effect of dilutive stock options and restricted stock 944 1,257 1,056 1,306
Diluted weighted average shares outstanding 47,175 47,320 47,009 47,262