Earnings per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	34,447,098	29,618,964	33,261,115	28,177,182
Impact of stock options outstanding under the 1997, 2006 and 2011 Stock Option Plans	439,364	384,383	323,111	498,461
Weighted average number of shares – diluted	34,886,462	30,003,347	33,584,226	28,675,643
Common stock that have been excluded from the diluted shares calculation	500,000	2,676,877	508,000	2,676,877
Stock options outstanding under the 2006, 2011 and 2013 Stock Option 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	584,586	508,000	584,586
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		2,092,291		2,092,291