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Earnings per Share (Detail)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Weighted average number of shares for calculation of basic EPS – Common Stock 35,063,671 31,606,986
Stock option under the 2006 and 2011 Equity Incentive Plans 528,356 476,563
Weighted average number of shares for calculation of diluted EPS 35,592,026 32,083,549
Common stock that have been excluded from the diluted shares calculation   1,034,021
Stock options outstanding under the 2006 and 2011 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   124,000
Series C Convertible Preferred Stock
    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock that have been excluded from the diluted shares calculation   910,021