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Segment Information (Details 1) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | $ 321,089,000 | $ 201,479,000 | $ 215,892,000 | $ 180,763,000 | $ 193,251,000 | $ 156,396,000 | $ 187,169,000 | $ 226,755,000 | $ 919,223,000 | $ 763,571,000 | $ 806,181,000
US Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 636,410,000 | 425,637,000 | 526,127,000
Canada Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 186,971,000 | 164,953,000 | 121,738,000
Europe And South Africa Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 73,947,000 | 83,102,000 | 72,125,000
Asia Pacific Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 45,378,000 | 42,234,000 | 73,882,000
Corporate And Other Segment Reporting Information [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | $ (23,483,000) | $ 47,645,000 | $ 12,309,000

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph h -Subparagraph 1(i) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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