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Restatement of the Consolidated Financial Statements - Effects of Restatements on Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current assets:                    
Cash and cash equivalents $ 30,486       $ 31,055       $ 33,207 $ 13,561
Restricted cash 23,761       21,314          
Trade accounts receivable, less allowances of $13,543 75,567       107,312          
Inventories 90,577       83,373          
Deferred income taxes 33,947       33,450          
Prepaid expenses and other current assets 25,906       34,079          
Total current assets 280,244       310,583          
Property, plant and equipment, net 54,606       53,835          
Patents and other intangible assets, net 9,046       7,290          
Goodwill 53,565   72,758   74,388       73,094  
Deferred income taxes 18,336       18,881          
Other long-term assets 7,385       7,920          
Total assets 423,182 430,058 459,450 475,758 472,897 539,566 530,395 694,106    
Current liabilities:                    
Bank borrowings         16          
Trade accounts payable 20,674       22,575          
Other current liabilities 46,146       39,594          
Total current liabilities 66,820       62,185          
Long-term debt 20,000       20,000          
Deferred income taxes 13,132       11,456          
Other long-term liabilities 12,736       11,424          
Total liabilities 112,688 111,001 114,223 102,366 105,065 193,599 205,196 381,734    
Contingencies (Note 17)                      
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 216,653       246,306          
Retained earnings 89,332       114,847          
Accumulated other comprehensive income 2,699       4,745          
Total shareholders' equity 310,494 319,057 345,227 373,392 367,832 345,967 325,199 312,372 292,074  
Total liabilities and shareholders' equity 423,182 430,058 459,450 475,758 472,897 539,566 530,395 694,106    
As Previously or Currently 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          503,380 504,281 565,073 553,320 707,586    
Current liabilities:                    
Bank borrowings         16          
Trade accounts payable         21,812          
Other current liabilities         46,969          
Total current liabilities         68,797          
Long-term debt         20,000          
Deferred income taxes         11,456          
Other long-term liabilities         4,930          
Total liabilities          101,212 105,183 187,463 199,104 369,178    
Contingencies (Note 17)                     
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          402,168 399,098 377,610 354,216 338,408    
Total liabilities and shareholders' equity          503,380 504,281 565,073 553,320 707,586    
Restatement 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          
Goodwill                     
Deferred income taxes         (1,023)          
Other long-term assets         (3,383)          
Total assets          (27,622) (31,384) (25,507) (22,925) (13,480)    
Current liabilities:                    
Bank borrowings                     
Trade accounts payable         763          
Other current liabilities         (7,375)          
Total current liabilities         (6,612)          
Long-term debt                     
Deferred income taxes                     
Other long-term liabilities         6,494          
Total liabilities          1,154 (118) 6,136 6,092 12,556    
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          
Retained earnings         (33,702)          
Accumulated other comprehensive income         2,241          
Total shareholders' equity          (28,776) (31,266) (31,643) (29,017) (26,036)    
Total liabilities and shareholders' equity          $ (27,622) $ (31,384) $ (25,507) $ (22,925) $ (13,480)