XML 44 R36.htm IDEA: XBRL DOCUMENT
v3.25.2

Share-based awards (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes option activity for the six months ended June 30, 2025:
| Options Outstanding Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2024 | 622,292 |  |  | $ | 170.52 |  |  | 3.91
Granted | 118,902 |  |  | $ | 185.18 |  |  |
Exercised | (58,784) |  |  | $ | 110.50 |  |  |
Forfeited/Expired | (11,623) |  |  | $ | 256.00 |  |  |
Outstanding at June 30, 2025 | 670,787 |  |  | $ | 176.90 |  |  | 4.30
Exercisable at June 30, 2025 | 436,041 |  |  | $ | 152.79 |  |  | 3.05
Schedule of Weighted Average Fair Values and Assumptions Used | The weighted average grant date fair values and assumptions used were as follows:
| Six Months Ended
| June 30, 2025 |  | June 30, 2024
Weighted average grant date fair value | $ | 64.42 |  |  | $ | 115.76 |
Assumptions: |  |  |
Expected volatility | 35 | % |  | 36 | %
Dividend yield | — | % |  | — | %
Risk-free interest rate | 4.00 | % |  | 4.20 | %
Expected life | 4.4 years |  | 4.3 years
Summary of RSU and PSU Activity | The following table summarizes RSU and PSU activity for the six months ended June 30, 2025:
| PSU Outstanding Number of Shares |  | PSU Weighted Average Grant Date Fair Value |  | RSU Outstanding Number of Shares |  | RSU Weighted Average Grant Date Fair Value
Outstanding at December 31, 2024 | 19,721 |  |  | $ | 280.76 |  |  | 647,589 |  |  | $ | 251.36 |
Granted | 41,359 |  |  | $ | 185.18 |  |  | 1,145,998 |  |  | $ | 130.15 |
Shares vested | (8,191) |  |  | $ | 231.68 |  |  | (26,013) |  |  | $ | 274.54 |
Forfeited | (11,502) |  |  | $ | 313.16 |  |  | (81,914) |  |  | $ | 239.84 |
Outstanding at June 30, 2025 | 41,387 |  |  | $ | 185.96 |  |  | 1,685,660 |  |  | $ | 169.15 |
Schedule of Non-Cash Stock Compensation Expense | Stock compensation expense for the three and six months ended June 30, 2025 and June 30, 2024 has been allocated as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2025 | June 30, 2024 |  | June 30, 2025 | June 30, 2024
| (in thousands)
Direct costs | $ | 9,290 |  | $ | 7,299 |  |  | $ | 14,671 |  | $ | 14,020 |
Selling, general and administrative | 6,143 |  | 7,665 |  |  | 13,056 |  | 14,125 |
Total | $ | 15,433 |  | $ | 14,964 |  |  | $ | 27,727 |  | $ | 28,145 |

X
- Definition Schedule of Non Cash Stock Compensation Expense. + References No definition available. + Details
Name: | iclr_ScheduleOfNonCashStockCompensationExpenseTableTextBlock
Namespace Prefix: | iclr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary Of Share Based Compensation Restricted Stock Units Performance Stock Units Award Activity [Table Text Block] + References No definition available. + Details
Name: | iclr_SummaryOfShareBasedCompensationRestrictedStockUnitsPerformanceStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | iclr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration