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v2.4.0.6

Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Revenue | $ 274,102 | $ 238,020 | $ 509,758 | $ 453,111
United States [Member] |  |  |  |
Revenue | 223,514 | 189,213 | 411,379 | 361,122
Canada [Member] |  |  |  |
Revenue | 38,284 | 40,330 | 74,722 | 75,469
Other Geographical Location [Member] |  |  |  |
Revenue | $ 12,304 | $ 8,477 | $ 23,657 | $ 16,520

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + 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 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_SalesRevenueServicesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration