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v2.4.1.9

Consolidated Statements of Cash Flows (Parenthetical) | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 GBP (£) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 GBP (£)
Supplemental Schedule of Noncash Investing and Financing Activities |  |  |  |  |
Cash dividends declared, but not yet paid | $ 2,600,000 us-gaap_DividendsPayableCurrentAndNoncurrent | $ 2,600,000 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |
Accrued capital expenditures | 3,400,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 1,800,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid |  |  |
Reduction in net assets |  | 44,200,000 int_IncreaseDecreaseInAssetsNet |  |  |
Reduction in noncontrolling interest equity |  | 25,574,000 us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation |  |  |
Increase in other investments |  | 25,600,000 int_IncreaseDecreaseInOtherInvestments |  |  |
Portion of equity awards granted that was previously recorded in accrued expenses and other current liabilities |  |  |  | 2,700,000 int_AllocatedShareBasedCompensationExpensePreviouslyRecordedInAccruedExpensesAndOtherCurrentLiabilities |
Current liability and other investments recorded related to contingent consideration |  | 2,800,000 us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 | 2,000,000 us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 | 16,300,000 us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 | 10,000,000 us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
Aggregate amount of contingent consideration paid |  | 19,100,000 int_PaymentOfContingentConsideration | 12,000,000 int_PaymentOfContingentConsideration |  |
Assets acquired, net of cash | 610,963,000 us-gaap_FairValueOfAssetsAcquired | 77,164,000 us-gaap_FairValueOfAssetsAcquired |  | 366,230,000 us-gaap_FairValueOfAssetsAcquired |
Liabilities assumed | 314,785,000 us-gaap_LiabilitiesAssumed1 | 36,765,000 us-gaap_LiabilitiesAssumed1 |  | 151,816,000 us-gaap_LiabilitiesAssumed1 |
Promissory notes issued for acquisition | $ 9,000,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred | $ 3,000,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |  | $ 7,200,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |

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