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Expected Long Term Rates of Return on Different Asset Classes (Detail) | 12 Months Ended
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Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |
Equity - Expected long-term return per annum | 6.60%
Bonds - Expected long-term return per annum | 4.70%

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- Definition Rate Of Return On Debt Securities + References No definition available. + Details
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Namespace Prefix: | iclr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Rate of Return on Equity Securities + References No definition available. + Details
Name: | iclr_RateOfReturnOnEquitySecurities
Namespace Prefix: | iclr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration