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Restatement of the Condensed Consolidated Financial Statements - Adjustments to Previously Filed Consolidated Income Statements (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net sales $ 103,373 $ 108,936
Cost of sales 25,617 21,378
Gross profit 77,756 87,558
Operating expenses    
Sales and marketing 45,054 47,128
General and administrative 18,330 14,570
Research and development 5,741 7,050
Amortization of intangibles assets 544 580
Charges related to U.S. Government resolutions    310
Total operation expenses 69,669 69,638
Operating income 8,087 17,920
Other income and (expense) 4,204 (2,852)
Income before income taxes 12,291 15,068
Income tax expense (4,681) (6,471)
Net income from continuing operations, net of tax 7,610 8,597
Previously Reported [Member]
    
Net sales 100,254 116,042
Cost of sales 22,699 21,940
Gross profit 77,555 94,102
Operating expenses    
Sales and marketing 48,839 49,521
General and administrative 18,788 14,570
Research and development 5,400 7,050
Amortization of intangibles assets 504 530
Charges related to U.S. Government resolutions      
Total operation expenses 73,531 71,671
Operating income 4,024 22,431
Other income and (expense) 4,204 (2,852)
Income before income taxes 8,228 19,579
Income tax expense (3,320) (7,363)
Net income from continuing operations, net of tax 4,908 12,216
Total Adjustments [Member]
    
Net sales 3,119 (7,106)
Cost of sales 2,918 (562)
Gross profit 201 (6,544)
Operating expenses    
Sales and marketing (3,785) (2,393)
General and administrative (458)   
Research and development 341   
Amortization of intangibles assets 40 50
Charges related to U.S. Government resolutions    310
Total operation expenses (3,862) (2,033)
Operating income 4,063 (4,511)
Other income and (expense)      
Income before income taxes 4,063 (4,511)
Income tax expense (1,361) 892
Net income from continuing operations, net of tax 2,702 (3,619)
Distributor Revenue [Member]
    
Net sales 2,963 (7,394)
Cost of sales 471 (1,471)
Gross profit 2,492 (5,923)
Operating expenses    
Sales and marketing (2,073) (417)
General and administrative      
Research and development      
Amortization of intangibles assets      
Charges related to U.S. Government resolutions      
Total operation expenses (2,073) (417)
Operating income 4,565 (5,506)
Other income and (expense)      
Income before income taxes 4,565 (5,506)
Income tax expense (1,529) 1,089
Net income from continuing operations, net of tax 3,036 (4,417)
Inventory Reserves [Member]
    
Net sales      
Cost of sales 86 (1,212)
Gross profit (86) 1,212
Operating expenses    
Sales and marketing      
General and administrative      
Research and development      
Amortization of intangibles assets      
Charges related to U.S. Government resolutions      
Total operation expenses      
Operating income (86) 1,212
Other income and (expense)      
Income before income taxes (86) 1,212
Income tax expense 29 (240)
Net income from continuing operations, net of tax (57) 972
Royalties [Member]
    
Net sales      
Cost of sales 2,030 2,126
Gross profit (2,030) (2,126)
Operating expenses    
Sales and marketing (2,030) (2,126)
General and administrative      
Research and development      
Amortization of intangibles assets      
Charges related to U.S. Government resolutions      
Total operation expenses (2,030) (2,126)
Operating income      
Other income and (expense)      
Income before income taxes      
Income tax expense      
Net income from continuing operations, net of tax      
Other [Member]
    
Net sales 156 288
Cost of sales 331 (5)
Gross profit (175) 293
Operating expenses    
Sales and marketing 318 150
General and administrative (458)   
Research and development 341   
Amortization of intangibles assets 40 50
Charges related to U.S. Government resolutions    310
Total operation expenses 241 510
Operating income (416) (217)
Other income and (expense)      
Income before income taxes (416) (217)
Income tax expense 139 43
Net income from continuing operations, net of tax $ (277) $ (174)