Income Taxes - Schedule of Tax Effects of Significant Temporary Differences Comprising Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Intangible assets and goodwill	$ 4,978	$ 5,346
Inventories and related reserves	14,678	14,020
Deferred revenue and cost of sales	9,669	11,682
Other accruals and reserves	3,200	3,868
Accrued compensation	3,880	3,817
Allowance for doubtful accounts	4,429	3,718
Accrued interest	17,775	18,229
Net operating loss carryforwards	34,215	27,231
Other, net	621	539
Total	93,445	88,450
Valuation allowance	(31,472)	(26,361)
Deferred tax asset	61,973	62,089
Withholding taxes	(13,132)	(11,456)
Property, plant and equipment	(9,690)	(9,758)
Deferred tax liability	(22,822)	(21,214)
Net deferred tax assets	$ 39,151	$ 40,875

Deferred Tax Assets Accrued Expenses And Reserves

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from interest, which can only be deducted for tax purposes when actual interest is incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Deferred Tax Assets Deferred Revenue And Expenses

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The aggregate net tax effects as of the balance sheet date of the amount of estimated future tax deductions and future taxable income arising from other temporary differences not otherwise specified in the taxonomy.

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The cumulative amount of the estimated future tax effects attributable to the difference between the tax basis of withholding taxes and the basis of withholding taxes computed in accordance with generally accepted accounting principles. The difference in basis will increase future taxable income when such difference reverses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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