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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Capital lease assets, Gross	$ 57,776		$ 54,004
Assets fully depreciated	21,276		22,160
Capital leased assets, Net book value	26,219		23,623
Accumulated depreciation	31,557		30,382
Actual purchases made under contract	8,452	6,319
Total cost incurred from lawsuits settlement	1,407
Other accrued expense current	$ 1,000		$ 1,200
Contract One [Member]
Commitments And Contingencies Disclosure [Line Items]
Extended term of contract	Dec. 31, 2014
Contract Two [Member]
Commitments And Contingencies Disclosure [Line Items]
Extended term of contract	Aug. 31, 2017
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated life of the capital lease	4 years
Noncancellable operating leases, renewal period	1 year
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated life of the capital lease	6 years
Noncancellable operating leases, renewal period	5 years

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Contract Expiration Date

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Gross value fully depreciated assets still in use.

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Purchases Made Under Purchase Commitments

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 45

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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-Publisher SEC

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-Number 210

-Section 02

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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