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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Commitments And Contingencies Disclosure [Line Items]
Capital lease assets, Gross	$ 65,080		$ 65,080		$ 54,004
Assets fully depreciated			20,312		22,160
Capital leased assets, Net book value	30,412		30,412		23,623
Accumulated depreciation	34,668		34,668		30,382
Future purchase obligation	0		0
Actual purchases made under contract	16,519	6,499	37,359	20,393
Total cost incurred for lawsuits settlement			1,407
Other accrued expense current	$ 0		$ 0		$ 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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Purchases Made Under Purchase Commitments

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

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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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-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735

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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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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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-Number 210

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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