Earnings per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	35,522,407	34,447,098	35,317,359	33,261,115
Stock option under the 2006, 2011 and 2013 Equity Incentive Plans	748,873	439,364	625,452	323,111
Weighted average number of shares for calculation of diluted EPS	36,271,280	34,886,462	35,942,811	33,584,226
Common stock that have been excluded from the diluted shares calculation		500,000		508,000
Stock options outstanding under the 2006, 2011 and 2013 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		500,000		508,000