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Cost of Revenue (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Cost of revenue | $ 329,289 | $ 297,253 | $ 973,729 | $ 847,940
Personnel expenses |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Cost of revenue | 223,976 | 203,011 | 671,518 | 583,649
Operational expenses |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Cost of revenue | 93,235 | 82,227 | 265,894 | 228,256
Depreciation and amortization |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Cost of revenue | $ 12,078 | $ 12,015 | $ 36,317 | $ 36,035

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 + Details
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