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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Denominator:        
Basic weighted average shares outstanding 46,004 46,012 45,813 45,901
Effect of dilutive stock options and restricted stock 986 1,251 1,112 1,332
Diluted weighted average shares outstanding 46,990 47,263 46,925 47,233