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Distribution of Income from Operations, excluding Restructuring and Other Items, by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Income from operations, excluding restructuring and other items | $ 130,200 | $ 73,653 | $ 39,260
Ireland |  |  |
Segment Reporting Information [Line Items] |  |  |
Income from operations, excluding restructuring and other items | 82,867 | 11,733 | (33,139)
Rest Of Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Income from operations, excluding restructuring and other items | 6,269 | 29,786 | 35,175
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Income from operations, excluding restructuring and other items | 33,564 | 23,687 | 30,127
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Income from operations, excluding restructuring and other items | $ 7,500 | $ 8,447 | $ 7,097

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- Definition Operating Income Loss Before Restructuring Charges + References No definition available. + Details
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Namespace Prefix: | iclr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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