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Business Segments, Geographic Information and Major Customers (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 9,779,555 us-gaap_Revenues | $ 11,713,463 us-gaap_Revenues | $ 11,342,475 us-gaap_Revenues | $ 10,550,896 us-gaap_Revenues | $ 10,404,653 us-gaap_Revenues | $ 10,493,661 us-gaap_Revenues | $ 10,479,604 us-gaap_Revenues | $ 10,184,029 us-gaap_Revenues | $ 43,386,389 us-gaap_Revenues | $ 41,561,947 us-gaap_Revenues | $ 38,945,338 us-gaap_Revenues
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 269,148 us-gaap_OperatingIncomeLoss | 264,358 us-gaap_OperatingIncomeLoss | 257,023 us-gaap_OperatingIncomeLoss
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 1,205,137 us-gaap_AssetsNoncurrent |  |  |  | 923,776 us-gaap_AssetsNoncurrent |  |  |  | 1,205,137 us-gaap_AssetsNoncurrent | 923,776 us-gaap_AssetsNoncurrent |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,879,980 us-gaap_Assets |  |  |  | 4,739,277 us-gaap_Assets |  |  |  | 4,879,980 us-gaap_Assets | 4,739,277 us-gaap_Assets |
United States |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 21,514,304 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 21,149,175 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 20,216,891 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 52,226 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = country_US | 49,874 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = country_US | 67,041 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = country_US
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 549,521 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 560,623 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 549,521 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US | 560,623 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,909,541 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 2,239,479 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 1,909,541 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 2,239,479 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US |
EMEA |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,612,751 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 7,017,479 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 7,247,754 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 121,660 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 109,650 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 82,964 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 591,481 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 319,339 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 591,481 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 319,339 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,695,200 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 1,347,020 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 1,695,200 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 1,347,020 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,200,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB | 5,000,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB | 5,200,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB
Asia/ Pacific |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 9,844,682 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 10,215,412 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 8,404,324 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 74,737 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 70,547 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 71,054 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 12,351 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 2,050 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 12,351 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 2,050 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 922,705 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 817,887 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 922,705 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 817,887 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |
Singapore |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 9,700,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_SG | 10,100,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_SG | 8,400,000 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_SG
Americas, excluding United States |  |  |  |  |  |  |  |  |  |  |
Information concerning our revenue, income from operations, non-current and total assets, as segregated between the Americas, EMEA (Europe, Middle East, and Africa) and the Asia/Pacific regions |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,414,652 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | 3,179,881 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | 3,076,369 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 20,525 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | 34,287 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | 35,964 us-gaap_OperatingIncomeLoss / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember
Non-current assets: |  |  |  |  |  |  |  |  |  |  |
Non-current assets | 51,784 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |  |  |  | 41,764 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |  |  |  | 51,784 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | 41,764 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |
Total assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 352,534 us-gaap_Assets / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |  |  |  | $ 334,891 us-gaap_Assets / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |  |  |  | $ 352,534 us-gaap_Assets / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember | $ 334,891 us-gaap_Assets / us-gaap_StatementGeographicalAxis = int_AmericasExcludingUnitedStatesMember |

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