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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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- 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 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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