Debt Instrument, Discount Rate

No definition available.

Name:	iclr_DebtInstrumentDiscountRate
Namespace Prefix:	iclr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Bank Credit Lines, Loan Facilities and Notes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	May 08, 2024	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 02, 2023	Jul. 01, 2021
Debt Instrument [Line Items]
Amortization of financing costs and debt discount										$ 23,533	$ 16,402	$ 17,749
Drawdown of credit lines and loan facilities										2,317,480	370,000	$ 75,000
Repayments of senior debt										373,000	315,000
Line of credit facility, remaining borrowing capacity						$ 55,000					55,000
Long-term debt at fair value		$ 3,469,200				$ 3,793,500				$ 3,469,200	$ 3,793,500
Senior Secured Term Loan \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.50%
Senior Secured Term Loan \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										2.00%
Senior Secured Revolving Loan \| Variable rate component one \| Base rate
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.10%
Senior Secured Revolving Loan \| Variable rate component one \| Base rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.45%
Senior Secured Revolving Loan \| Variable rate component one \| Base rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.00%
Senior Secured Revolving Loan \| Variable rate component two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Standard & Poor's, BB Rating
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										1.45%
Senior Secured Revolving Loan \| Variable rate component two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Standard & Poor's, BB+ Rating
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										1.10%
Senior Secured Revolving Loan \| Variable rate component two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Standard & Poor's, BBB- Rating
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.85%
Senior Secured Revolving Loan \| Variable rate component two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Standard & Poor's, BBB Rating
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.65%
Senior Secured Revolving Loan \| Variable rate component two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Standard & Poor's, BBB+ Rating
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)										0.50%
Senior Secured Term Loan \| Senior Secured Term Loan
Debt Instrument [Line Items]
Debt instrument, principal amount														$ 5,515,000
Debt instrument, interest rate (in percent)		6.329%				7.86%				6.329%	7.86%			1.00%
Accelerated charge on repayments		$ 16,900				$ 7,900				$ 16,900	$ 7,900
Senior Secured Term Loan \| Senior secured credit facility and senior secured notes
Debt Instrument [Line Items]
Debt discount paid														$ 27,600
Senior Secured Notes (the "2026 Notes")
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 2,000,000
Debt discount paid	6,800
Senior Secured Notes (the "2026 Notes") \| Senior Secured Notes (the "2026 Notes")
Debt Instrument [Line Items]
Debt instrument, principal amount														$ 500,000
Debt instrument, interest rate (in percent)		2.875%				2.875%				2.875%	2.875%			2.875%
Senior Secured Notes (the "2026 Notes") \| Senior Secured Notes (the "2027 Notes")*
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 750,000
Debt instrument, interest rate (in percent)	5.809%	5.809%				0.00%				5.809%	0.00%
Debt instrument, discount rate on underwriting (in percent)	0.00250
Senior Secured Notes (the "2026 Notes") \| Senior Secured Notes (the "2029 Notes")*
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 750,000
Debt instrument, interest rate (in percent)	5.849%	5.849%				0.00%				5.849%	0.00%
Debt instrument, discount rate on underwriting (in percent)	0.00350
Senior Secured Notes (the "2026 Notes") \| Senior Secured Notes (the "2034 Notes")*
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 500,000
Debt instrument, interest rate (in percent)	6.00%	6.00%				0.00%				6.00%	0.00%
Debt discount paid	$ 500
Debt instrument, discount rate on underwriting (in percent)	0.00450
Debt instrument, redemption price, percentage of principal amount redeemed	99.896%
Senior Secured Revolving Loan \| Senior Secured Revolving Loan
Debt Instrument [Line Items]
Debt instrument, interest rate (in percent)		0.00%				6.72%				0.00%	6.72%
Senior Secured Revolving Loan \| Senior Secured Revolving Loan \| Senior Secured Revolving Loan
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 500,000	$ 300,000
Drawdown of credit lines and loan facilities		$ 75,000	$ 50,000	$ 143,000	$ 50,000	$ 65,000	$ 75,000	$ 50,000	$ 180,000	$ 318,000	$ 370,000