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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

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