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General - Schedule of Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]    
Earnings from continuing operations $ 5,642 $ 5,560
Less dividend equivalents attributable to restricted stock units outstanding (59)  
Earnings from continuing operations attributable to common shareholders used for basic earnings per share calculation 5,583 5,560
Discontinued operations 4,708 925
Net earnings attributable to common shareholders used for basic earnings per share calculation $ 10,291 $ 6,485
Weighted-average number of common shares outstanding:    
Basic 33,397 33,394
Stock options      
Diluted 33,397 33,394
Restricted stock units outstanding at the end of the period 296 219