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Restatement of the Condensed Consolidated Financial Statements - Effects of Restatements on Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 27,370 $ 31,055 $ 50,089 $ 33,207
Restricted cash 20,601 21,314    
Trade accounts receivable, less allowances of $13,543 90,828 107,312    
Inventories 94,941 83,373    
Deferred income taxes 33,664 33,450    
Prepaid expenses and other current assets 28,993 34,079    
Total current assets 296,397 310,583    
Property, plant and equipment, net 55,166 53,835    
Patents and other intangible assets, net 6,857 7,290    
Goodwill 72,758 74,388    
Deferred income taxes 19,205 18,881    
Other long-term assets 9,067 7,920    
Total assets 459,450 472,897    
Current liabilities:        
Trade accounts payable 18,894 22,575    
Other current liabilities 52,679 39,610    
Total current liabilities 71,573 62,185    
Long-term debt 20,000 20,000    
Deferred income taxes 12,326 11,456    
Other long-term liabilities 10,324 11,424    
Total liabilities 114,223 105,065    
Contingencies (Note 16)          
Shareholders' equity:        
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding 1,849 1,934    
Additional paid-in capital 225,148 246,306    
Retained earnings 117,030 114,847    
Accumulated other comprehensive income 1,200 4,745    
Total shareholders' equity 345,227 367,832    
Total liabilities and shareholders' equity 459,450 472,897    
Previously Reported [Member]
        
Current assets:        
Cash and cash equivalents   31,055    
Restricted cash   21,314    
Trade accounts receivable, less allowances of $13,543   150,316    
Inventories   88,744    
Deferred income taxes   16,959    
Prepaid expenses and other current assets   32,056    
Total current assets   340,444    
Property, plant and equipment, net   51,362    
Patents and other intangible assets, net   6,880    
Goodwill   74,388    
Deferred income taxes   19,904    
Other long-term assets   11,303    
Total assets   504,281    
Current liabilities:        
Trade accounts payable   21,812    
Other current liabilities   46,985    
Total current liabilities   68,797    
Long-term debt   20,000    
Deferred income taxes   11,456    
Other long-term liabilities   4,930    
Total liabilities   105,183    
Contingencies (Note 16)         
Shareholders' equity:        
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding   1,934    
Additional paid-in capital   246,111    
Retained earnings   148,549    
Accumulated other comprehensive income   2,504    
Total shareholders' equity   399,098    
Total liabilities and shareholders' equity   504,281    
Adjustments [Member]
        
Current assets:        
Cash and cash equivalents         
Restricted cash         
Trade accounts receivable, less allowances of $13,543   (43,004)    
Inventories   (5,371)    
Deferred income taxes   16,491    
Prepaid expenses and other current assets   2,023    
Total current assets   (29,861)    
Property, plant and equipment, net   2,473    
Patents and other intangible assets, net   410    
Deferred income taxes   (1,023)    
Other long-term assets   (3,383)    
Total assets   (31,384)    
Current liabilities:        
Trade accounts payable   763    
Other current liabilities   (7,375)    
Total current liabilities   (6,612)    
Other long-term liabilities   6,494    
Total liabilities   (118)    
Contingencies (Note 16)         
Shareholders' equity:        
Additional paid-in capital   195    
Retained earnings   (33,702)    
Accumulated other comprehensive income   2,241    
Total shareholders' equity   (31,266)    
Total liabilities and shareholders' equity   $ (31,384)