Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Reserves and allowances not currently deductible for tax purposes	$ 16,953	$ 15,617
Basis difference related to fixed assets	13,137	10,711
Compensation and benefits	6,878	3,808
Basis difference for inventory valuation	1,593	2,502
Compensatory stock options and rights	3,925	5,238
Deferred revenue and other	459	101
Operating loss carryforwards	94,639	105,748
Tax credit carryforwards	11,584	6,024
Correlative effects of global income allocations	0	363
Federal impact of state taxes	0	808
Basis difference related to intangible assets with a definite life	18,363	6,165
Total deferred tax assets	167,531	157,085
Valuation allowance for deferred tax assets	(158,747)	(151,097)
Deferred tax assets, net of valuation allowance	8,784	5,988
Deferred tax liabilities:
State taxes, net of federal income tax benefit	1	(33)
Prepaid expenses	(970)	(1,102)
Deferred revenue	0	(330)
Other	(84)	(69)
Basis difference related to intangible assets with an indefinite life	(34,284)	(32,834)
Total deferred tax liabilities	(35,337)	(34,368)
Net deferred tax liabilities	(26,553)	(28,380)
Net deferred tax assets are shown on the accompanying consolidated balance sheets as follows:
Current deferred tax assets	6,419	4,170
Non-current deferred tax assets	2,299	1,910
Current deferred tax liabilities	0	(927)
Non-current deferred tax liabilities	(35,271)	(33,533)
Net deferred tax assets (liabilities)	$ (26,553)	$ (28,380)