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Distribution of Income from Operations, excluding Restructuring and Other Items, by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Income from operations, excluding Restructuring and other items | $ 30,920 | $ 16,640 | $ 58,328 | $ 28,372
Ireland |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations, excluding Restructuring and other items | 13,556 | 1,770 | 25,897 | (4,526)
Rest Of Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations, excluding Restructuring and other items | 5,198 | 7,247 | 10,755 | 16,968
U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations, excluding Restructuring and other items | 9,579 | 4,362 | 17,369 | 10,919
Rest of World |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations, excluding Restructuring and other items | $ 2,587 | $ 3,261 | $ 4,307 | $ 5,011

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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