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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 100,284	$ 100,994	$ 100,985	$ 100,014	$ 105,886	$ 91,806	$ 97,640	$ 102,279	$ 402,277	$ 397,611	$ 440,189
Cost of sales	21,457	25,268	25,414	26,773	34,123	25,064	21,884	25,841	98,912	106,912	100,726
Gross profit	78,827	75,726	75,571	73,241	71,763	66,742	75,756	76,438	303,365	290,699	339,463
Operating expense	74,874	69,218	68,867	73,270	81,842	80,843	68,836	70,370	286,229	301,891	264,591
Operating (loss) income	3,953	6,508	6,704	(29)	(10,079)	(14,101)	6,920	6,068	17,136	(11,192)	74,872
Net (loss) income from continuing operations	(5,090)	28	3,266	(1,948)	(9,639)	(16,504)	2,012	5,926	(3,744)	(18,205)	45,121
Net (loss) income	$ (5,798)	$ 452	$ (683)	$ (2,508)	$ (10,412)	$ (18,836)	$ (3,011)	$ 3,447	$ (8,537)	$ (28,812)	$ 42,852
Basic:
Net (loss) income from continuing operations	$ (0.27)	$ 0.00	$ 0.18	$ (0.11)	$ (0.53)	$ (0.91)	$ 0.11	$ 0.31	$ (0.20)	$ (0.97)	$ 2.38
Net (loss) income	$ (0.31)	$ 0.02	$ (0.04)	$ (0.14)	$ (0.58)	$ (1.04)	$ (0.16)	$ 0.18	$ (0.46)	$ (1.54)	$ 2.26
Diluted:
Net (loss) income from continuing operations	$ (0.27)	$ 0.00	$ 0.18	$ (0.11)	$ (0.53)	$ (0.91)	$ 0.10	$ 0.30	$ (0.20)	$ (0.97)	$ 2.33
Net (loss) income	$ (0.31)	$ 0.02	$ (0.04)	$ (0.14)	$ (0.58)	$ (1.04)	$ (0.16)	$ 0.18	$ (0.46)	$ (1.54)	$ 2.21