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Other Assets - Components of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Statement of Financial Position [Abstract] |  |
Investments related to the deferred compensation plan | $ 6,008 us-gaap_DeferredCompensationPlanAssets | $ 4,827 us-gaap_DeferredCompensationPlanAssets
Long-term investments | 31,759 us-gaap_EquityMethodInvestments | 21,242 us-gaap_EquityMethodInvestments
Other long-term assets | 28,448 us-gaap_OtherAssetsMiscellaneousNoncurrent | 1,522 us-gaap_OtherAssetsMiscellaneousNoncurrent
Long-term trade receivable | 16,985 us-gaap_AccountsReceivableNetNoncurrent | 0 us-gaap_AccountsReceivableNetNoncurrent
Long-term notes receivable | 14,231 us-gaap_NotesAndLoansReceivableNetNoncurrent | 0 us-gaap_NotesAndLoansReceivableNetNoncurrent
Long-term investments and marketable securities | 0 us-gaap_LongTermInvestments | 2,588 us-gaap_LongTermInvestments
Deposits | 1,486 us-gaap_DepositsAssetsNoncurrent | 1,174 us-gaap_DepositsAssetsNoncurrent
Total | $ 98,917 us-gaap_OtherAssetsNoncurrent | $ 31,353 us-gaap_OtherAssetsNoncurrent

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- Definition Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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