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Quarterly Financial Data - Condensed Consolidated Statement of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	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, 2013	Dec. 31, 2012	Dec. 31, 2011
Interim Reporting [Line Items]
Net sales	$ 105,886us-gaap_SalesRevenueNet	$ 91,806us-gaap_SalesRevenueNet	$ 97,640us-gaap_SalesRevenueNet	$ 102,279us-gaap_SalesRevenueNet	$ 115,607us-gaap_SalesRevenueNet	$ 105,818us-gaap_SalesRevenueNet	$ 111,601us-gaap_SalesRevenueNet	$ 107,163us-gaap_SalesRevenueNet	$ 397,611us-gaap_SalesRevenueNet	$ 440,189us-gaap_SalesRevenueNet	$ 435,519us-gaap_SalesRevenueNet
Cost of sales	34,123us-gaap_CostOfGoodsAndServicesSold	25,064us-gaap_CostOfGoodsAndServicesSold	21,884us-gaap_CostOfGoodsAndServicesSold	25,841us-gaap_CostOfGoodsAndServicesSold	26,751us-gaap_CostOfGoodsAndServicesSold	24,887us-gaap_CostOfGoodsAndServicesSold	24,943us-gaap_CostOfGoodsAndServicesSold	24,145us-gaap_CostOfGoodsAndServicesSold	106,912us-gaap_CostOfGoodsAndServicesSold	100,726us-gaap_CostOfGoodsAndServicesSold	96,415us-gaap_CostOfGoodsAndServicesSold
Gross profit	71,763us-gaap_GrossProfit	66,742us-gaap_GrossProfit	75,756us-gaap_GrossProfit	76,438us-gaap_GrossProfit	88,856us-gaap_GrossProfit	80,931us-gaap_GrossProfit	86,658us-gaap_GrossProfit	83,018us-gaap_GrossProfit	290,699us-gaap_GrossProfit	339,463us-gaap_GrossProfit	339,104us-gaap_GrossProfit
Operating expense	81,842us-gaap_OperatingExpenses	80,843us-gaap_OperatingExpenses	68,836us-gaap_OperatingExpenses	70,370us-gaap_OperatingExpenses	62,338us-gaap_OperatingExpenses	63,988us-gaap_OperatingExpenses	70,036us-gaap_OperatingExpenses	68,229us-gaap_OperatingExpenses	301,891us-gaap_OperatingExpenses	264,591us-gaap_OperatingExpenses	332,493us-gaap_OperatingExpenses
Operating (loss) income	(10,079)us-gaap_OperatingIncomeLoss	(14,101)us-gaap_OperatingIncomeLoss	6,920us-gaap_OperatingIncomeLoss	6,068us-gaap_OperatingIncomeLoss	26,518us-gaap_OperatingIncomeLoss	16,943us-gaap_OperatingIncomeLoss	16,622us-gaap_OperatingIncomeLoss	14,789us-gaap_OperatingIncomeLoss	(11,192)us-gaap_OperatingIncomeLoss	74,872us-gaap_OperatingIncomeLoss	6,611us-gaap_OperatingIncomeLoss
Net income (loss) from continuing operations	(9,639)	(16,504)	2,012	5,926	17,518	9,312	11,421	6,870	(18,205)	45,121	(15,806)
Net (loss) income	(10,412)us-gaap_NetIncomeLoss	(18,836)us-gaap_NetIncomeLoss	(3,011)us-gaap_NetIncomeLoss	3,447us-gaap_NetIncomeLoss	22,954us-gaap_NetIncomeLoss	3,747us-gaap_NetIncomeLoss	8,802us-gaap_NetIncomeLoss	7,349us-gaap_NetIncomeLoss	(28,812)us-gaap_NetIncomeLoss	42,852us-gaap_NetIncomeLoss	(17,698)us-gaap_NetIncomeLoss
Basic:
Net income (loss) from continuing operations	$ (0.53)	$ (0.91)	$ 0.11	$ 0.31	$ 0.91	$ 0.49	$ 0.61	$ 0.37	$ (0.97)	$ 2.38	$ (0.87)
Net income (loss)	$ (0.58)us-gaap_EarningsPerShareBasic	$ (1.04)us-gaap_EarningsPerShareBasic	$ (0.16)us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic	$ 1.19us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ (1.54)us-gaap_EarningsPerShareBasic	$ 2.26us-gaap_EarningsPerShareBasic	$ (0.97)us-gaap_EarningsPerShareBasic
Diluted:
Net income (loss) from continuing operations	$ (0.53)	$ (0.91)	$ 0.10	$ 0.30	$ 0.89	$ 0.48	$ 0.59	$ 0.36	$ (0.97)	$ 2.33	$ (0.87)
Net income (loss)	$ (0.58)us-gaap_EarningsPerShareDiluted	$ (1.04)us-gaap_EarningsPerShareDiluted	$ (0.16)us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 1.17us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ (1.54)us-gaap_EarningsPerShareDiluted	$ 2.21us-gaap_EarningsPerShareDiluted	$ (0.97)us-gaap_EarningsPerShareDiluted
Originally Reported in 2013 Form 10-Q [Member]
Interim Reporting [Line Items]
Net sales				100,254
Cost of sales				22,699
Gross profit				77,555
Operating expense				73,531
Operating (loss) income				4,024
Net income (loss) from continuing operations				4,908
Net (loss) income				2,116
Basic:
Net income (loss) from continuing operations				$ 0.25
Net income (loss)				$ 0.11
Diluted:
Net income (loss) from continuing operations				$ 0.25
Net income (loss)				$ 0.11
Original Restatement Adjustments [Member]
Interim Reporting [Line Items]
Net sales				3,119	5,330	(6,895)	(6,069)	(7,105)		(14,739)	(28,150)
Cost of sales				2,918	6,440	2,011	3,871	(561)		11,761	2,908
Gross profit				201	(1,110)	(8,906)	(9,940)	(6,544)		(26,500)	(31,058)
Operating expense				(3,862)	(2,242)	(6,178)	(3,673)	(2,033)		(14,126)	(5,649)
Operating (loss) income				4,063	1,132	(2,728)	(6,267)	(4,511)		(12,374)	(25,409)
Net income (loss) from continuing operations				2,702	1,373	(2,544)	(4,097)	(3,618)		(8,886)	(14,478)
Net (loss) income				2,384	647	(2,544)	(3,951)	(2,609)		(8,457)	(17,037)
Basic:
Net income (loss) from continuing operations				$ 0.14	$ 0.07	$ (0.14)	$ (0.22)	$ (0.19)		$ (0.47)	$ (0.79)
Net income (loss)				$ 0.12	$ 0.04	$ (0.14)	$ (0.21)	$ (0.14)		$ (0.45)	$ (0.93)
Diluted:
Net income (loss) from continuing operations				$ 0.14	$ 0.07	$ (0.13)	$ (0.22)	$ (0.19)		$ (0.46)	$ (0.79)
Net income (loss)				$ 0.12	$ 0.03	$ (0.14)	$ (0.21)	$ (0.14)		$ (0.43)	$ (0.93)
Originally Reported in 2013 Form 10-Q/A [Member]
Interim Reporting [Line Items]
Net sales				103,373
Cost of sales				25,617
Gross profit				77,756
Operating expense				69,669
Operating (loss) income				8,087
Net income (loss) from continuing operations				7,610
Net (loss) income				4,500
Basic:
Net income (loss) from continuing operations				$ 0.39
Net income (loss)				$ 0.23
Diluted:
Net income (loss) from continuing operations				$ 0.39
Net income (loss)				$ 0.23
Further Restatement Adjustments [Member]
Interim Reporting [Line Items]
Net sales	(257)	(932)	(640)	(1,094)	(1,758)	(2,039)	(1,822)	(1,773)	(2,923)	(7,392)	(6,452)
Cost of sales	1,606	1,144	1,638	224	1,807	503	(2,604)	2,767	4,612	2,473	888
Gross profit	(1,863)	(2,076)	(2,278)	(1,318)	(3,565)	(2,542)	782	(4,540)	(7,535)	(9,865)	(7,340)
Operating expense	1,838	(3,575)	(394)	701	(4,470)	(680)	(1,542)	(1,409)	(1,430)	(8,101)	(8,051)
Operating (loss) income	(3,701)	1,499	(1,884)	(2,019)	905	(1,862)	2,324	(3,131)	(6,105)	(1,764)	711
Net income (loss) from continuing operations	(1,075)	1,580	(2,118)	(1,684)	1,509	(1,262)	1,551	(1,727)	(3,297)	71	412
Net (loss) income	(2,536)	986	(694)	(1,053)	1,793	(1,269)	1,548	(2,058)	(3,297)	14	412
Basic:
Net income (loss) from continuing operations	$ (0.06)	$ 0.09	$ (0.11)	$ (0.08)	$ 0.08	$ (0.06)	$ 0.09	$ (0.09)	$ (0.17)	$ 0.01	$ 0.02
Net income (loss)	$ (0.15)	$ 0.06	$ (0.04)	$ (0.05)	$ 0.09	$ (0.06)	$ 0.09	$ (0.11)	$ (0.17)	$ 0.01	$ 0.02
Diluted:
Net income (loss) from continuing operations	$ (0.06)	$ 0.09	$ (0.11)	$ (0.09)	$ 0.08	$ (0.06)	$ 0.08	$ (0.09)	$ (0.17)	$ 0.01	$ 0.02
Net income (loss)	$ (0.15)	$ 0.06	$ (0.04)	$ (0.05)	$ 0.10	$ (0.06)	$ 0.09	$ (0.11)	$ (0.17)	$ 0.00	$ 0.02
Originally Reported [Member]
Interim Reporting [Line Items]
Net sales	106,143	92,738	98,280
Cost of sales	32,517	23,920	20,246
Gross profit	73,626	68,818	78,034
Operating expense	80,004	84,418	69,230
Operating (loss) income	(6,378)	(15,600)	8,804
Net income (loss) from continuing operations	(8,564)	(18,084)	4,130
Net (loss) income	(7,876)	(19,822)	(2,317)						(25,515)
Basic:
Net income (loss) from continuing operations	$ (0.47)	$ (1.00)	$ 0.22
Net income (loss)	$ (0.43)	$ (1.10)	$ (0.12)
Diluted:
Net income (loss) from continuing operations	$ (0.47)	$ (1.00)	$ 0.21
Net income (loss)	$ (0.43)	$ (1.10)	$ (0.12)
Originally Reported in 2013 Form 10-K [Member]
Interim Reporting [Line Items]
Net sales	106,143	92,738	98,280						400,534
Cost of sales	32,517	23,920	20,246						102,300
Gross profit	73,626	68,818	78,034						298,234
Operating expense	80,004	84,418	69,230						303,321
Operating (loss) income	(6,378)	(15,600)	8,804						(5,087)
Net income (loss) from continuing operations	(8,564)	(18,084)	4,130						(14,908)
Net (loss) income	(7,876)	(19,822)	(2,317)
Basic:
Net income (loss) from continuing operations	$ (0.47)	$ (1.00)	$ 0.22						$ (0.80)
Net income (loss)	$ (0.43)	$ (1.10)	$ (0.12)						$ (1.37)
Diluted:
Net income (loss) from continuing operations	$ (0.47)	$ (1.00)	$ 0.21						$ (0.80)
Net income (loss)	$ (0.43)	$ (1.10)	$ (0.12)						$ (1.37)
As Reported in the 2012 Form 10-K Prior to Original Restatement [Member]
Interim Reporting [Line Items]
Net sales					112,035	114,752	119,492	116,041		462,320	470,121
Cost of sales					18,504	22,373	23,676	21,939		86,492	92,619
Gross profit					93,531	92,379	95,816	94,102		375,828	377,502
Operating expense					69,050	70,846	75,251	71,671		286,818	346,193
Operating (loss) income					24,481	21,533	20,565	22,431		89,010	31,309
Net income (loss) from continuing operations					14,636	13,118	13,967	12,215		53,936	(1,740)
Net (loss) income					20,514	7,560	11,205	12,016		51,295	(1,073)
Basic:
Net income (loss) from continuing operations					$ 0.76	$ 0.69	$ 0.74	$ 0.65		$ 2.84	$ (0.10)
Net income (loss)					$ 1.06	$ 0.40	$ 0.59	$ 0.64		$ 2.70	$ (0.06)
Diluted:
Net income (loss) from continuing operations					$ 0.74	$ 0.67	$ 0.73	$ 0.64		$ 2.78	$ (0.10)
Net income (loss)					$ 1.04	$ 0.39	$ 0.58	$ 0.63		$ 2.64	$ (0.06)
Originally Restated [Member]
Interim Reporting [Line Items]
Net sales								108,936
Cost of sales								21,378
Gross profit								87,558
Operating expense								69,638
Operating (loss) income								17,920
Net income (loss) from continuing operations								8,597
Net (loss) income								9,407
Basic:
Net income (loss) from continuing operations								$ 0.46
Net income (loss)								$ 0.50
Diluted:
Net income (loss) from continuing operations								$ 0.45
Net income (loss)								$ 0.49
As Originally Restated in the 2012 Form 10-K/A [Member]
Interim Reporting [Line Items]
Net sales					117,365	107,857	113,423			447,581	441,971
Cost of sales					24,944	24,384	27,547			98,253	95,527
Gross profit					92,421	83,473	85,876			349,328	346,444
Operating expense					66,808	64,668	71,578			272,692	340,544
Operating (loss) income					25,613	18,805	14,298			76,636	5,900
Net income (loss) from continuing operations					16,009	10,574	9,870			45,050	(16,218)
Net (loss) income					$ 21,161	$ 5,016	$ 7,254			$ 42,838	$ (18,110)
Basic:
Net income (loss) from continuing operations					$ 0.83	$ 0.55	$ 0.52			$ 2.37	$ (0.89)
Net income (loss)					$ 1.10	$ 0.26	$ 0.38			$ 2.25	$ (0.99)
Diluted:
Net income (loss) from continuing operations					$ 0.81	$ 0.54	$ 0.51			$ 2.32	$ (0.89)
Net income (loss)					$ 1.07	$ 0.25	$ 0.37			$ 2.21	$ (0.99)