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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net sales $ 98,280 $ 113,423 $ 201,653 $ 222,359
Cost of sales 20,246 27,547 45,863 48,925
Gross profit 78,034 85,876 155,790 173,434
Operating expenses        
Sales and marketing 44,910 47,075 89,964 94,203
General and administrative 15,204 14,295 33,534 28,865
Research and development 8,551 9,252 14,292 16,302
Amortization of intangibles assets 565 580 1,109 1,160
Charges related to U.S. Government resolutions   376   686
Total operating expenses 69,230 71,578 138,899 141,216
Operating income 8,804 14,298 16,891 32,218
Other income and (expense) (1,677) (605) 2,527 (3,457)
Income before income taxes 7,127 13,693 19,418 28,761
Income tax expense (2,997) (3,823) (7,678) (10,294)
Net income from continuing operations, net of tax 4,130 9,870 11,740 18,467
Previously Reported [Member]
        
Net sales   119,492   235,534
Cost of sales   23,676   45,616
Gross profit   95,816   189,918
Operating expenses        
Sales and marketing   49,810   99,331
General and administrative   14,295   28,865
Research and development   9,252   16,302
Amortization of intangibles assets   530   1,060
Charges related to U.S. Government resolutions   1,364   1,364
Total operating expenses   75,251   146,922
Operating income   20,565   42,996
Other income and (expense)   (605)   (3,457)
Income before income taxes   19,960   39,539
Income tax expense   (5,993)   (13,356)
Net income from continuing operations, net of tax   13,967   26,183
Total Adjustments [Member]
        
Net sales   (6,069)   (13,175)
Cost of sales   3,871   3,309
Gross profit   (9,940)   (16,484)
Operating expenses        
Sales and marketing   (2,735)   (5,128)
Amortization of intangibles assets   50   100
Charges related to U.S. Government resolutions   (988)   (678)
Total operating expenses   (3,673)   (5,706)
Operating income   (6,267)   (10,778)
Income before income taxes   (6,267)   (10,778)
Income tax expense   2,170   3,062
Net income from continuing operations, net of tax   (4,097)   (7,716)
Distributor Revenue [Member]
        
Net sales   (5,862)   (13,256)
Cost of sales   (2,101)   (3,572)
Gross profit   (3,761)   (9,684)
Operating expenses        
Sales and marketing   (527)   (944)
Total operating expenses   (527)   (944)
Operating income   (3,234)   (8,740)
Income before income taxes   (3,234)   (8,740)
Income tax expense   1,120   2,209
Net income from continuing operations, net of tax   (2,114)   (6,531)
Inventory Reserves [Member]
        
Cost of sales   3,880   2,668
Gross profit   (3,880)   (2,668)
Operating expenses        
Operating income   (3,880)   (2,668)
Income before income taxes   (3,880)   (2,668)
Income tax expense   1,343   1,103
Net income from continuing operations, net of tax   (2,537)   (1,565)
Royalties [Member]
        
Cost of sales   2,079   4,205
Gross profit   (2,079)   (4,205)
Operating expenses        
Sales and marketing   (2,079)   (4,205)
Total operating expenses   (2,079)   (4,205)
Other [Member]
        
Net sales   (207)   81
Cost of sales   13   8
Gross profit   (220)   73
Operating expenses        
Sales and marketing   (129)   21
Amortization of intangibles assets   50   100
Charges related to U.S. Government resolutions   (988)   (678)
Total operating expenses   (1,067)   (557)
Operating income   847   630
Income before income taxes   847   630
Income tax expense   (293)   (250)
Net income from continuing operations, net of tax   $ 554   $ 380