Earnings per Share (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	33,652,646	28,352,864	22,605,518
Stock options under Plans	470,995	509,599	849,104
Weighted average number of shares for calculation of diluted EPS – Common Stock	34,123,641	28,862,463	23,454,622
Common stock that have been excluded from the diluted shares calculation	550,000	1,680,891	3,798,518
Stock options outstanding under the 1993,1997, 2006 and 2011 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	550,000	149,000	84,000
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		1,531,891	3,714,518