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Earnings Per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Diluted shares        
Basic weighted average shares outstanding 58,708,193 58,392,240 58,599,783 58,226,687
Diluted weighted average shares outstanding 58,708,193 58,392,240 58,599,783 58,226,687
Stock options excluded from dilutive calculation because they would be anti-dilutive 4,097,632 5,766,411 4,454,749 5,979,348