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Restatement of the Condensed Consolidated Financial Statements - Effects of Restatement on Condensed Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Current assets:        
Cash and cash equivalents $ 33,675 [1] $ 31,055 $ 47,053 $ 33,207
Restricted cash 29,446 [1] 21,314    
Trade accounts receivable, less allowances of $11,731 96,506 [1] 107,312    
Inventories 84,691 [1] 83,373    
Deferred income taxes 33,915 [1] 33,450    
Prepaid expenses and other current assets 34,390 [1] 34,079    
Total current assets 312,623 [1] 310,583    
Property, plant and equipment, net 54,119 [1] 53,835    
Patents and other intangible assets, net 6,935 [1] 7,290    
Goodwill 72,607 [1] 74,388    
Deferred income taxes 19,176 [1] 18,881    
Other long-term assets 10,298 [1] 7,920    
Total assets 475,758 [1] 472,897    
Current liabilities:        
Trade accounts payable 14,987 [1] 22,575    
Other current liabilities 44,729 [1] 39,610    
Total current liabilities 59,716 [1] 62,185    
Long-term debt 20,000 [1] 20,000    
Deferred income taxes 12,225 [1] 11,456    
Other long-term liabilities 10,425 [1] 11,424    
Total liabilities 102,366 [1] 105,065    
Contingencies (Note 17)    [1]       
Shareholders' equity:        
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding 1,945 [1] 1,934    
Additional paid-in capital 250,381 [1] 246,306    
Retained earnings 119,347 [1] 114,847    
Accumulated other comprehensive income 1,719 [1] 4,745    
Total shareholders' equity 373,392 [1] 367,832    
Total liabilities and shareholders' equity 475,758 [1] 472,897    
Previously Reported [Member]
        
Current assets:        
Cash and cash equivalents 33,675 31,055    
Restricted cash 29,446 21,314    
Trade accounts receivable, less allowances of $11,731 132,425 150,316    
Inventories 92,133 88,744    
Deferred income taxes 17,363 16,959    
Prepaid expenses and other current assets 32,211 32,056    
Total current assets 337,253 340,444    
Property, plant and equipment, net 52,402 51,362    
Patents and other intangible assets, net 6,765 6,880    
Goodwill 72,607 74,388    
Deferred income taxes 20,200 19,904    
Other long-term assets 14,153 11,303    
Total assets 503,380 504,281    
Current liabilities:        
Trade accounts payable 14,230 21,812    
Other current liabilities 51,295 46,985    
Total current liabilities 65,525 68,797    
Long-term debt 20,000 20,000    
Deferred income taxes 11,460 11,456    
Other long-term liabilities 4,227 4,930    
Total liabilities 101,212 105,183    
Contingencies (Note 17)          
Shareholders' equity:        
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding 1,945 1,934    
Additional paid-in capital 250,186 246,111    
Retained earnings 150,665 148,549    
Accumulated other comprehensive income (628) 2,504    
Total shareholders' equity 402,168 399,098    
Total liabilities and shareholders' equity 503,380 504,281    
Adjustments [Member]
        
Current assets:        
Cash and cash equivalents          
Restricted cash          
Trade accounts receivable, less allowances of $11,731 (35,919) (43,004)    
Inventories (7,442) (5,371)    
Deferred income taxes 16,552 16,491    
Prepaid expenses and other current assets 2,179 2,023    
Total current assets (24,630) (29,861)    
Property, plant and equipment, net 1,717 2,473    
Patents and other intangible assets, net 170 410    
Goodwill          
Deferred income taxes (1,024) (1,023)    
Other long-term assets (3,855) (3,383)    
Total assets (27,622) (31,384)    
Current liabilities:        
Trade accounts payable 757 763    
Other current liabilities (6,566) (7,375)    
Total current liabilities (5,809) (6,612)    
Long-term debt          
Deferred income taxes 765       
Other long-term liabilities 6,198 6,494    
Total liabilities 1,154 (118)    
Contingencies (Note 17)          
Shareholders' equity:        
Common shares $0.10 par value; 50,000,000 shares authorized; 19,339,329 issued and outstanding          
Additional paid-in capital 195 195    
Retained earnings (31,318) (33,702)    
Accumulated other comprehensive income 2,347 2,241    
Total shareholders' equity (28,776) (31,266)    
Total liabilities and shareholders' equity $ (27,622) $ (31,384)    
[1] Unaudited