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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
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Current assets:          
Cash and cash equivalents $ 22,219   $ 31,055 $ 53,572 $ 33,207
Restricted cash 22,732   21,314    
Trade accounts receivable, less allowances of $13,543 75,252   107,312    
Inventories 100,204   83,373    
Deferred income taxes 34,053   33,450    
Prepaid expenses and other current assets 27,313   34,079    
Total current assets 281,773   310,583    
Property, plant and equipment, net 55,762   53,835    
Patents and other intangible assets, net 9,821   7,290    
Goodwill 55,405 72,758 74,388   73,094
Deferred income taxes 19,911   18,881    
Other long-term assets 7,386   7,920    
Total assets 430,058   472,897    
Current liabilities:          
Trade accounts payable 14,710   22,575    
Other current liabilities 51,308   39,610    
Total current liabilities 66,018   62,185    
Long-term debt 20,000   20,000    
Deferred income taxes 12,834   11,456    
Other long-term liabilities 12,149   11,424    
Total liabilities 111,001   105,065    
Contingencies (Note 16)            
Shareholders' equity:          
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding 1,810   1,934    
Additional paid-in capital 215,081   246,306    
Retained earnings 97,208   114,847    
Accumulated other comprehensive income 4,958   4,745    
Total shareholders' equity 319,057   367,832    
Total liabilities and shareholders' equity 430,058   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:          
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)