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Consolidated Statements of Cash Flows (Parenthetical)
 12 Months Ended
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 $ 2,600,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 2,600,000us-gaap_DividendsPayableCurrentAndNoncurrent      
Accrued capital expenditures 3,400,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 1,800,000us-gaap_CapitalExpendituresIncurredButNotYetPaid      
Reduction in net assets   44,200,000int_IncreaseDecreaseInAssetsNet      
Reduction in noncontrolling interest equity   25,574,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation      
Increase in other investments   25,600,000int_IncreaseDecreaseInOtherInvestments      
Portion of equity awards granted that was previously recorded in accrued expenses and other current liabilities       2,700,000int_AllocatedShareBasedCompensationExpensePreviouslyRecordedInAccruedExpensesAndOtherCurrentLiabilities  
Current liability and other investments recorded related to contingent consideration   2,800,000us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 2,000,000us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 16,300,000us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1 10,000,000us-gaap_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumed1
Aggregate amount of contingent consideration paid   19,100,000int_PaymentOfContingentConsideration 12,000,000int_PaymentOfContingentConsideration    
Assets acquired, net of cash 610,963,000us-gaap_FairValueOfAssetsAcquired 77,164,000us-gaap_FairValueOfAssetsAcquired   366,230,000us-gaap_FairValueOfAssetsAcquired  
Liabilities assumed 314,785,000us-gaap_LiabilitiesAssumed1 36,765,000us-gaap_LiabilitiesAssumed1   151,816,000us-gaap_LiabilitiesAssumed1  
Promissory notes issued for acquisition $ 9,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred $ 3,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred   $ 7,200,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred