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Calculations of Basic and Diluted Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income - basic and diluted $ 3,890 $ 7,533 $ 5,793 $ 8,647
Net interest expense, 4.75% Convertible Senior Notes   83    
Net income - diluted $ 3,890 $ 7,616 $ 5,793 $ 8,647
Weighted-average shares outstanding - basic 12,546 12,089 12,482 12,075
Effect of dilutive securities:        
Stock options 254 413 298 422
4.75% Convertible Senior Notes   140    
Weighted-average shares outstanding - diluted 12,800 12,642 12,780 12,497
Basic income per common share $ 0.31 $ 0.62 $ 0.46 $ 0.72
Diluted income per common share $ 0.30 $ 0.60 $ 0.45 $ 0.69