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Earnings per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Weighted average number of shares for calculation of basic EPS 36,442,296 35,970,992 36,399,635 35,870,649
Stock options under equity incentive plans 194,922 613,858 172,595 557,858
Weighted average number of shares for calculation of diluted EPS 36,637,218 36,584,850 36,572,230 36,428,507
Stock options outstanding for equity incentive plans        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Common stock that have been excluded from the diluted shares calculation 1,437,534   1,437,534